Plant Species of the Borrego Desert: 2009-2010 Blooms

California fish-hook cactus, Mammillaria dioica
desert apricot, Prunus fremontii

Both pictures taken on 24 January 2010 in Hellhole Canyon (one canyon south of Borrego Palm Canyon immediately west of Borrego Springs) by Mike Crouse.

Table of Contents

Rainfall This Season

Annual Germination, Growth and Blooms
     General Requirements for Annual Germination
     Bad Bloom Years Are All The Same; Good Bloom Years Are All Different
     Peak Bloom: What Does That Mean?
     Summary of Annual Germination, Growth and Blooms in 2009-2010

     Detailed Germination, Growth and Bloom Reports From Each Hike
     Pictures From Each Hike

How Long Will An Annual Bloom Last
     General Factors
     Predictions for This Year

Species in Bloom On Each Trip
     Number of Species and Plants in Bloom On Each Trip
     List of Species in Bloom On Each Trip, With Photographs
     Pictorial Gallery of Species in Bloom To Date in 2009-2010, organized by flower color

Links to Other Webpages on Anza-Borrego Desert State Park Blooms


The Borrego Desert is the northern part of Anza-Borrego Desert State Park below an elevation of ~3000 feet, named for the Borrego Valley and the town of Borrego Springs (map and expanded definition).

This page gives information about the 2009-2010 bloom for all species in this area, with emphasis on the annuals that are responsible for the widespread showy blooms that appear in some years on the desert floor. The date of the last update to this page is given at the bottom of this page.

For the progress of last year's bloom, see 2008-2009 Blooms.

In addition to specific information about current conditions, this page also gives some general information on what is needed to germinate those annuals, and what is needed to sustain the annual bloom.

The information here is by no means a definitive list to what is blooming at all locations in the Borrego Desert; it only records the species I've seen in bloom on my trips that occur roughly every fourth day. Because the locations change, the numbers of species in bloom, and the number of plants in bloom, cannot usually be directly compared from trip to trip. However, the information here will give the reader an idea of what the bloom is doing in the Borrego Desert.

Note that there is often quite a difference in the annual bloom between the moister canyons west of Borrego Springs and the drier areas around the Badlands. Similarly, even within those canyons on the west, there can be large differences between the north-facing and south-facing slopes, and between canyons with permanent water, like Borrego Palm Canyon, and drier canyons. In the drier areas to the east, there can be large differences between the edges of washes and the middle of washes, and between shady canyons and open areas.

The locations for each hike are in the detailed reports below; more information is sometimes given in Botanical Trail Reports in Chronological Order, which usually includes more information about the bloom on each trip.

Rainfall This Season

Rainfall is the most important determinant of blooms. Rainfall is usually highest on the mountain slopes, especially on the west edge of the Borrego Desert, and falls off dramatically with lower elevation to the east. This occurs whenever our rainfall is mostly orographic. However, when rainfall is from convection, the deserts can at times get more rainfall than the coast. (See Precipitation types.)

In addition to desert stations, I've also given the rainfall from my house in Fallbrook, on the coastal side at 680 feet elevation, to show the large difference in rainfall between the wet side of the mountains and the dry side.

Table 1 gives the storm totals, in inches, as of the last day of each storm. The storm totals were taken from the Weather Service Rainfall Storm Summary, except for Fallbrook and the Borrego Badlands / Ocotillo Wells. Occasionally other stations are missing in that report; if so, totals are taken from the Rainfall Summary Map. Rainfall reports for Ocotillo Wells are reported at here for the month to date.

If a station didn't appear in the summary, or I couldn't find it elsewhere on line, I usually assumed the rainfall total was zero. Although this assumption is probably usually correct, it is not necessarily always valid since missing data plague all rain reports. In a few cases, when it was clear that some rainfall must have been received at those missing stations, I've guesstimated the rainfall.

Note that the total rainfall at the bottom of the table is since 1 October, since rain that falls earlier doesn't germinate the desert annuals (see below). This rainfall total may be different from the rainfall reported by the Anza-Borrego Desert State Park Visitor Center using the normal California rainfall year that begins on 1 July.

Table 1. Rainfall Events Since 1 October 2009

DateFallbrookSan FelipeAgua CalienteBorrego Palm CanyonBorrego SpringsBorrego Badlands /
Ocotillo Wells
13 October 20090.
28 November 20090.420.
7 December 20091.931.411.09~1.01.24~1.2
11-13 December 20091.460.5??0.3??0.130.18~0.00
22 December 20090.130.2?0.2?~0.080.08~0.00
18-22 January 20105.24~6.0?~6.0?~5.5?4.891.65
27 January 20100.16~0.0?~0.0?~0.0?0.010.00
6-7 February 20101.730.430.360.07?0.070.18
10 February 20100.470.150.15?0.25?0.250.05
Total Since 1 October11.85~8.88?~8.21?~7.12?6.75~3.08

The reported rainfall of 0.34 inches for Borrego Palm Canyon on 12/7/09 is unlikely to be correct, since nearly everywhere in San Diego County received an inch of rain or more. Automatic rainfall gauges often get clogged, causing under-reported rainfall, which is probably what happened here. I've replaced it by an estimated 1.0 inches.

On 2/13/10, the Visitor Center billboard reported 6.94 inches of rain, compared to the total above of 6.75 inches from the National Weather Service station in Borrego Springs, and my estimate of 7.12 inches from Borrego Palm Canyon, so my estimate was probably fairly accurate.

On 12/31/09, the rainfall given at the Visitor Center since July 1, 2009 matched closely the Borrego Springs total rainfall given above since there was no monsoonal rain at the Visitor Center in 2009.

Annual Germination, Growth and Blooms

General Requirements for Annual Germination

The timing of rainfall is extremely important for the annual bloom. Rainfall received in the summer and early fall will not germinate the annuals that bloom in February and March. Rainfall received after January will either not germinate those annuals, or will germinate them too late for them to produce a robust bloom in most years. Thus rain must fall in October, November, and/or December in order to germinate the annuals that produce the showy mass displays.

The amount in a single storm is also important. Native annuals require about an inch of rainfall, received over no longer than a period of something like several days, in order to germinate. Our native annuals have learned the hard way that any less rainfall doesn't guarantee enough moisture in the soil for them to produce seeds.

Unfortunately, non-native annuals can germinate on less rainfall, and can sometimes get a head start over our native annuals if we get a first rainfall much less than an inch.

See Predicting Desert Wildflower Blooms - The science behind the spectacle from the Arizona-Sonora Desert Museum for information relating to Arizona desert blooms. Many of our annual species respond a bit differently, since we have much less monsoonal rain and more winter rain, but some of our species follow the Arizona rules.

Bad Bloom Years Are All The Same; Good Bloom Years Are All Different

Janice Emily Bowers, with her vast experience in desert blooms, said it best in her book Flowers and Shrubs of the Mojave Desert, 1998, p. 4:

... maybe one in five [springs] will bring a good wildflower display. All bad springs are more or less alike in that wildflowers are scarce or not to be seen, but all good years are different in that no two have the same abundance of flowers or the same combinations of species. This is because different kinds of annual wildflowers have different requirements for germination and growth.

This is just as true for the Borrego and Sonoran Deserts.

Peak Bloom: What Does That Mean?

The term Peak Bloom means different things to different people:

Most of the time, I use the latter definition of Peak Bloom, but I also try to mention when the carpets of flowers are present.

If you are looking for a particular species in bloom, the time of Peak Bloom doesn't matter to you; you want to know only when that species is in bloom. Plant species bloom at different times; it is not possible to see every species in bloom even over the time period of a month.

For example, if you want to see the beautiful blooms of beavertail cactus, Opuntia basilaris, you'll need to come just after the showy annual carpets are finished. If you want to see the beautiful flowers of desert-willow, Chilopsis linearis ssp. arcuata, then you'll need to come here in summer, when few species are blooming except for it.

See observed dates of peak bloom in 2008-2009 for various locations.

These annual species produce the showy carpets of flowers:

Other annuals can produce carpets of flowers, but are either more limited in their distribution, such as Bigelow's monkeyflower, Mimulus bigelovii, or purple mat, Nama demissum; or don't produce such showy displays, such as Fremont pincushion, Chaenactis fremontii (since fields of white don't show up well against the whitish background of the desert soil).

Summary of Annual Germination, Growth and Blooms in 2009-2010

The widespread inch of rain on 12/7/09 produced excellent native annual germination west of Borrego Springs, but poor native annual germination east of Borrego Springs. East of Borrego Springs, including the floor of eastern Clark Valley and Beckman and Fonts Point Wash in the Borrego Badlands, almost 100% of the germinated annuals are the non-native Asian mustard, Brassica tournefortii.

The widespread 1.5-5 inches of rain on 18-22 January 2010 essentially guarantees a decent wildflower display west of Borrego Springs unless we get several weeks of temperatures over 90° F. This rainfall was apparently too late to produce good annual germination east of Borrego Springs. Many of the native annuals that were germinated from this rain in that area might be overwhelmed by the non-native Asian mustard due to its huge head start.

Many of the first annuals blooming now in all of the Borrego Springs area are very small plants, perhaps because they germinated in December instead of earlier, and / or because the temperatures since then have been cool, without any warm spells until after they started blooming.

In contrast, the perennials and shrubs are blooming beautifully this year from all the rain. They are the stars of the show this year.

We are in the take-off phase for the bloom, the time of year when the number of plants in blooms begins to double every week or two. See the plots below for how the bloom unfolded last year. Since 1 January, we are now following last year's curves of the number of species in bloom, and the number of plants in bloom, for each trip, closely. It thus looks like last year's curves can be used as the best guess for what will happen in the near future this year, although there is a hint that this year's bloom is unfolding somewhat more slowly due to the cooler weather this year.

Detailed Germination, Growth and Bloom Reports From Each Hike

Detailed reports for the last two months are given here; for earlier reports, see Reports from 29 October 2009 to 24 January 2010.

These reports are just summaries of these conditions from each hike.

See also Detailed Germination, Growth and Bloom Reports From Each Hike in 2008-2009.

12/19/09: Clark Valley. We saw only 34 plants of 7 species in bloom today, which is more typical of most places in the Borrego Desert than the places we have been visiting so far this season. It is too early for blooms in most places that don't have a permanent source of water, or received summer rainfall.

We saw a zillion baby annuals that have sprouted, but unfortunately they are all silver dollar size clumps of the non-native Asian mustard, Brassica tournefortii. It is hard to imagine that just 15 years ago this invasive species was not even present here.

12/23/09: Agua Caliente County Park. This area is not in the Borrego Desert, but its report is included here anyway. The star of the show for me was seeing a single open bloom of Lycium parishii, Parish's desert-thorn, which is found only south of the Borrego Desert. This was the first time I had seen this species in bloom. We saw 18 species total in bloom. (Since this area is not in the Borrego Desert, the numbers from this trip are not included in the plots and tables below, or in the list of species in bloom.)

12/27/09: Elephant Tree Area, Alma Canyon, Starfish Cove. The bloom was almost identical to what was seen on 12/15/09, but we noticed fewer plants of each species in bloom, since this was mostly a hiking trip so we could finally get to Starfish Cove.

12/31/09: California Riding and Hiking Trail, Lower Hellhole Canyon part. It seemed like we had gone back in time by coming to this area after the Elephant Tree Area. Annuals were just germinating, with many showing just their cotyledons or first true leaves. Some of the shrubs were just leafing out.

1/3/10: California Riding and Hiking Trail, Culp Valley and upper Hellhole Canyon part. This trip was at 2600 feet elevation and above, and very few plants were in bloom. Interestingly, some of the annuals were a bit more advanced than seen lower on this trail four days ago, instead of being a bit farther behind.

1/7/10: Hellhole Canyon to Maidenhair Falls. There is excellent annual germination in Hellhole Canyon itself, and decent germination underneath the shrubs on the alluvial plain below. In particular, the Phacelia distans plants are growing robustly, with ~8 good-sized leaves or so on each plant. About ten plants of bladderpod, Isomeris arborea, are in good bloom.

1/10/10: Borrego Badlands: Fonts Point Wash and Beckman Wash. It was almost shocking to see the lack of native annual germination in this area. To a first approximation, the only annuals that have germinated here are those of the non-native Asian mustard, Brassica tournefortii. We only observed a few baby plants of narrow-leaved cryptantha, Cryptantha angustifolia, and a few other native annuals. Worse, even if native annuals germinate later, they will be overwhelmed by the non-native Asian mustard due to its huge head start.

We observed rosettes of 3-4 leaves on several desert lilies, Hesperocallis undulata, but the last leaf reverted to a much-smaller size, indicating that it might be running of our moisture. That doesn't augur well for its good bloom unless we get further rain.

As is often the case, the number of plants in bloom in the Borrego Badlands was way less here than we observed any place else so far this year. We found a grand total of 4 plants in bloom, each a different species.

We also found a single plant on the S22 roadside of Salton milk-vetch, Astragalus crotalariae, with a number of buds.

1/15/10: Hellhole Canyon to beyond Maidenhair Falls. Conditions are much the same as on 1/7/10, with the annuals all a bit bigger.

1/24/10: Hellhole Canyon to beyond Maidenhair Falls. It rained! It rained a lot! This hike was delayed by six days due to a glorious five days of rain.

Hellhole Canyon Creek is flowing quite strongly above the Canyon mouth; water is shooting down Maidenhair Falls; the ground is wet everywhere; and the annuals are looking great. The annuals are no longer little rosettes with a few leaves in many places; they are now forming masses with foliage some distance above the ground.

The widespread ~5 inches of rain here on 18-22 January guarantees a good wildflower display to come at least in this canyon.

The stars of the show today were a few specimens of California fish-hook cactus, Mammillaria dioica, in full bloom along the portion of the trail in the alluvial fan, and the first few plants of desert apricot, Prunus fremontii in bloom (both pix by Mike Crouse).

We observed three tiny plants of the first winter annual in bloom, but unfortunately the species was the non-native redstem filaree, Erodium cicutarium.

1/28/10: Borrego Palm Canyon: Palm Grove Loop. The biggest delight of the day was to quite unexpectedly see the rock crossosoma, Crossosoma bigelovii, in beautiful fragrant bloom. The scent was very strong and delightful, and the plants were beautiful, covered with bloom.

The first mats of annual flowers were present, but they were mats that only a serious botanist would notice. They were from the first flowers of curvenut combseed, Pectocarya recurvata, which has a minute flower, just ~1 mm (1/25 inch) across. The other first-flowering mass annual here, hairy-podded pepper-grass, Lepidium lasiocarpum, was already showing its first fruit, along with what passes for flowers in this self-fertilized species.

We spent considerable time verifying all the species on the plant trail guide, to see how many of the species seen in the glorious year of 2005 were present this year. The variation is almost entirely due to annual species, since the perennials and shrubs stick around for a very long time.

Nearly all annual species are present (of course, these were all babies, with few in flower yet). For example, in the first 0.02 mile of the trail, we found 18 annual species present, most in great abundance, with only three winter annual species seen in prior years not in evidence in this short stretch of trail (Lotus strigosus, Perityle emoryi, Camissonia claviformis). The latter two species were found later on the trail. Most surprisingly, one of those 18 annual species, the native Texas filaree, Erodium texanum, had not been seen previously anywhere on this trail in 2003-2005!

It is going to be a good bloom year in the canyons west of Borrego Springs.

1/31/10: Borrego Palm Canyon: Palm Grove Loop and above the first grove. Three new species popped into bloom today: white fiesta flower, Pholistoma membranaceum; cheesebush, Hymenoclea salsola var. salsola; and deerweed, Lotus scoparius var. brevialatus, all represented by one to two plants or a single location. The fiesta flower was quite a surprise, since we saw it at the end of the day on the Alternate Trail, after previously seeing one zillion plants not yet showing any buds. A number of plants in that one location were quite covered with bloom.

Cheesebush is nearly impossible to tell when it is in bloom by eye. What most people think of as the flowers for this species are actually the bracts on the fruit. But the bees know when it is in bloom, so all we had to do to find the plants in bloom was to watch for the bees!

The Asian mustard, Brassica tournefortii, has begun to bloom in mass in several places on surprisingly tiny plants. I would have thought the abundance of rain would have led these plants to delay bloom while they grew more robustly, which is what 99% of the other plants of this species are doing. Keith Haworth speculated that maybe other nutrients were in short supply here, and I speculated that maybe these plants had already decided to begin blooming before the heavy rain of two weeks previously. But perhaps it was some other feature of this location not easily apparent to humans, just like the patch of fiesta flower in bloom.

Overall, we found at least 491 total plants of 28 species in bloom, including four species not seen previously this season so far (the fourth one was common cudweed, Gnaphalium luteo-album, which had clearly been in bloom previously, but we had just not encountered it before this trip).

2/9/10: Borrego Palm Canyon: Palm Grove Loop and above the first grove. Eight new species were found into bloom today, including one of the stars of the annual show, Phacelia distans. See the list below for the complete list of the species found in bloom here. Many cheesebush plants are now in bloom, and some of them are beginning to produce their showy fruit that many mistake for their bloom.

Many of the species in bloom here can be found right at the parking area, which would keep a plant photographer busy for some time without the need for any hiking.

Surprisingly, many of the first annuals blooming now are very small plants, perhaps because they germinated in December instead of earlier.

In the Canyon above the first palm grove, we were pleased to come across five plants of San Jacinto beardtongue, Penstemon clevelandii var. connatus, that had buds just about to pop.

Altogether, we observed over 1,094 plants of 44 species in bloom today.

2/13/10: Little Surprise Canyon, Galleta Meadows, Henderson Canyon Road, Fonts Point Wash. This was primarily a one hour early-morning car trip to quickly survey some major bloom areas prior to a CNPS Orange County Chapter Pilostyles Tour I was leading at 11:00 a.m. At the end of the Pilostyles Tour, we then returned to Henderson Canyon Road and surveyed it more slowly.

I was quite surprised at how few blooms I found. Little Surprise Canyon, up to just a bit beyond the split of the branches, had only five species in bloom, and two of them were non-natives. At Galleta Meadows, I found only three additional species in bloom, and they were very small plants, typical of many of the annuals I've seen in bloom so far this year. These plants clearly germinated too late to grow any bigger.

On Henderson Canyon Road, in the usual hairy desert-sunflower location, beside the huge dominance of the Asian mustard, Brassica tournefortii, there, there were a large number of young plants of hairy desert-sunflower, Geraea canescens. But they were far from bloom. The largest were at least several weeks away from bloom, and there were a large number of very small plants with just a few true leaves that had clearly germinated only in the last several weeks.

The best spot was just west of the Pegleg Monument, where the lowermost slope and base of Coyote Mountain had about ten species in bloom, including the very first flowers of desert star, Monoptilon bellioides; and yellow-head, Trichoptilium incisum; of the year.

Near the Beckman Wash entrance along S22 west of Inspiration Wash, one glorious plant of Salton milk-vetch, Astragalus crotalariae, was in beautiful full bloom, due to the extra early water the road runoff provided.

Fonts Point Wash was nearly devoid of life, let alone blooms. Most of the Pilostyles host plant, dyeweed, Psorothamnus emoryi; along with the burroweed, Ambrosia dumosa; were just beginning to leaf out! No native annuals were present in the wash at all. It is just astounding how this area could look like it was in a severe drought year, despite all the rain of the last two months here.

Overall, this mostly-car-trip found only 535 plants of 21 species in bloom, about half of what we found for both numbers in Borrego Palm Canyon alone four days earlier. However, eight of these species were seen in bloom for the first time by me, since this trip was the first one of mine covering the desert floor for a while.

2/15/10: Borrego Palm Canyon: Palm Grove Loop and above the first grove. Nine new species were found into bloom today, including the first desert dandelion and first desert chicory along the Campground Road. Parish's poppy, Eschscholzia parishii, has now joined small-flowered poppy, Eschscholzia minutiflora, in bloom along the Borrego Palm Canyon Trail. See the list below for the complete list of the species found in bloom here.

We continue to find that the annuals in bloom are very small. A dramatic example is shown by Mike Crouse's picture of hairy-podded pepper-grass, Lepidium lasiocarpum var. lasiocarpum, in bloom and fruit, with the tip of a ball-point pen (~8 mm = ~0.3 inches) alongside it for scale. The entire plant is less than a half inch tall, whereas in good years it is ten times taller.

Perennials and shrubs continue to bloom very well; they are the stars of the show this year.

Don't forget the species with beautiful smells, too! We came across several desert mistletoe, Phoradendron californicum, whose delightful fragrance we could smell from one hundred feet away or so. On the Alternate Trail, we smelled one that we couldn't even find. Rock crossosoma, Crossosoma bigelovii; and lotebush, Ziziphus parryi; also produce heady fragrances that make one wish just to hang around them to continue delighting in their fragrance.

Pictures From Each Hike

Most of the pictures in the Pictorial Gallery of Species in Bloom To Date in 2009-2010, organized by flower color, have been taken this year. The date and location of each picture are given in that table.

Most of the rest of my pictures were taken for scientific purposes, and not specifically to show anything about the bloom. However, they may be of interest to people showing some aspects of what the bloom was like on a given date. My pictures are not even on standard webpages; Table 2 gives links to a directory and you have to click on the link for each picture to see it. Scientific names are used almost exclusively for the picture names.

The context for most of these pictures is sometimes given in the botanical reports from each hike.

Table 2. Links to Directories With Pictures From Each Trip

October 29
November 15
November 19
November 22
November 25
December 1
December 5
December 9
December 15
December 19
December 23
December 27
December 31
January 3
January 7
January 10
January 24
January 28
January 31
February 9
February 13
February 15

See also Pictures From Each Hike in 2008-2009.

How Long Will An Annual Bloom Last

General Factors

Past Rainfall, Future Rainfall, and Heat are the main factors determining how long an annual bloom will last on the desert floor at about 1000 feet elevation:

Predictions for This Year

It looks like we are following last year's pattern quite closely, or perhaps with a week or so delay, so the best estimate of when peak bloom will occur is to use the observed dates of peak bloom in 2008-2009, perhaps delayed by a week or two. Not surprisingly, the Park Rangers are predicting the peak bloom this year to be the same as last year. On 2/10/10, the Park released a press notice that said:

Environmental Services Intern Paul Johnson predicts a "very good to outstanding" bloom this spring, with the peak expected between the last week of February and the second week of March, depending on the weather.

There is no doubt that we are having a very good perennial and shrub bloom, and will continue to do so. These plants have absolutely loved all the rain they have received.

In contrast, I am quite skeptical that we are going to have a very good to outstanding annual bloom, but this will probably be a decent year for them. It could even be a good year if the heat holds off and we get more rain. But I don't think spectacular is in the cards. We needed earlier rain than we got for that to have happened.

However, I hope I am wrong. (:-)

Species in Bloom On Each Trip

Number of Species and Plants in Bloom On Each Trip

Five plots are given below; each plot has this year's bloom data as well as last year's bloom data for comparison:

The plots and the table here must be interpreted cautiously, for at least three reasons:

Figure 1. Number of Species in Bloom on Each Trip

Figure 2. Number of Plants in Bloom on Each Trip

Figure 3. Cumulative Number of Species Seen in Bloom From All Trips

Figure 4. Cumulative Number of Annual Species Seen in Bloom From All Trips

Figure 5. Percent of All Species Seen in Bloom From All Trips That Are Annuals

Table 3 gives the numbers used for the above plots, for the last two months. For earlier numbers, see Numbers from 29 October 2009 to 24 January 2010. The individual observations used to obtain these numbers are in the List of Species in Bloom On Each Trip.

Table 3. Number of Species and Total Number of Plants in Bloom on Each Trip

Number of12/1912/2712/311/31/71/101/151/241/281/312/92/132/15

List of Species in Bloom On Each Trip, With Photographs

Table 4 gives the number of plants observed to be in bloom for each species on each hike, with a maximum value of 99 plants for each species. This maximum value prevents one species from dominating the total plants in bloom, and makes it much easier on me to keep track of the bloom.

Because the hike locations vary, some species will not be present on every hike, so the lack of an entry for a given hike says nothing about whether that species is blooming elsewhere.

The Checklist is sorted first by category, with dicots before monocots, and then by family and scientific name. The Family and Scientific Name are from the Jepson Manual. An asterisk before the Common Name indicates a non-native taxon.

See Plant Family Abbreviations to obtain the full family name from the abbreviations used in the table below.

The Checklist has thumbnail photographs for most of the species, all of which were taken in the Borrego Desert. Clicking on the thumbnail photograph gives a larger version equal in size to the ones at the top of this page.

All the larger versions are also presented in Pictorial Gallery of Species in Bloom To Date in 2009-2010, organized by flower color.

All pictures were taken by myself except the following:

This table gives the number of plants in bloom only in the last two months. Some species thus have no number of plants in bloom listed in this table since they were observed in bloom only on trips prior to that date. For those earlier trips, see list of species seen in bloom from 29 October 2009 to 24 January 2010..

Some species that have bloomed in the Borrego Desert are not listed here, since I never observed them in bloom. Such species are found only in a few locations, and I either never visited those locations or they bloomed in between my visits to their location.

Of course, species that bloom later in the year, and species that do not have flowers (ferns, etc.) are not present in this list, so it is not the equivalent of a plant checklist for the Borrego Desert.

Table 4. List of Species in Bloom On Each Trip

#FAMScientific NamePixCommon Name12/1912/2712/311/31/71/101/151/241/281/312/92/132/15
1ACAJusticia californicachuparosa 2030 50 99999999992099
2AMAAmaranthus fimbriatusfringed amaranth             
3ASCAsclepias subulatarush milkweed             
4ASCSarcostemma cynanchoides ssp. hartwegiiclimbing milkweed             
5ASTAdenophyllum porophylloidesSan Felipe dogweed      1 1   1
6ASTAmbrosia dumosaburroweed             
7ASTAmbrosia psilostachyawestern ragweed             
8ASTBaccharis salicifoliamule fat    2   21   
9ASTBebbia juncea var. asperasweetbush550215 52153010 10
10ASTBrickellia desertorumdesert brickellia             
11ASTChrysothamnus paniculatuspunctate rabbitbrush             
12ASTConyza canadensishorseweed             
13ASTDicoria canescensdesert dicoria             
14ASTEncelia farinosabrittlebush 2      12151010
15ASTEricameria brachylepisboundary goldenbush  21    1    
16ASTGnaphalium luteo-album*common cudweed         25  
17ASTGutierrezia sarothraematchweed         1   
18ASTHymenoclea salsola var. salsolacheesebush         299 99
19ASTIsocoma acradenia var. eremophilasolitary-leaved alkali goldenbush             
20ASTLepidospartum squamatumscale-broom             
21ASTMalacothrix glabratadesert dandelion            3
22ASTMonoptilon bellioidesdesert star           1 
23ASTPalafoxia arida var. aridadesert needle     1     2 
24ASTPectis papposa var. papposachinch-weed             
25ASTPerityle emoryiEmory's rock-daisy 1           
26ASTRafinesquia neomexicanadesert chicory            1
27ASTSenecio flaccidus var. monoensisMono ragwort             
28ASTSolidago californicagoldenrod       1  1  
29ASTStephanomeria exigua ssp. exiguaslender wreathplant             
30ASTStephanomeria pauciflora var. pauciflorawire-lettuce1102 3        
31ASTTrichoptilium incisumyellow-head           1 
32ASTViguiera parishiiParish's viguiera   1     31 2
33BORAmsinckia menziesii var. intermediacommon fiddleneck            50
34BORAmsinckia tessellata var. tessellatabristly fiddleneck           2 
35BORCryptantha angustifolianarrow-leaved cryptantha           5020
36BORCryptantha racemosabushy cryptantha 1           
37BORHeliotropium curassavicumseaside heliotrope             
38BORPectocarya recurvatacurvenut combseed        9999999999
39BORTiquilia palmeriPalmer's coldenia             
40BORTiquilia plicataplicate coldenia             
41BRABrassica tournefortii*Asian mustard         50999999
42BRADescurainia pinnatawestern tansy-mustard            3
43BRADithyrea californicaspectacle-pod           3 
44BRAGuillenia lasiophyllaCalifornia mustard            20
45BRALepidium lasiocarpum var. lasiocarpumhairy-podded pepper-grass        20  2010
46BRALyrocarpa coulteri var. palmeriCoulter's lyrepod 1      5    
47BRASisymbrium irio*London rocket          20 20
48BRAThysanocarpus curvipesfringe-pod            20
49CACMammillaria dioicaCalifornia fish-hook cactus    1  3  1 1
50CAPIsomeris arboreabladderpod    10 1010     
51CHEChenopodium murale*nettle-leaved goosefoot          10 10
52CRACrassula connatapygmy-weed          999999
53CROCrossosoma bigeloviirock crossosoma        41820 20
54EUPChamaesyce micromeraSonoran spurge             
55EUPChamaesyce polycarpasmall-seeded spurge 1020     1   1
56EUPChamaesyce setilobaYuma spurge 10           
57EUPCroton californicusCalifornia croton     1     5 
58EUPDitaxis lanceolatanarrowleaf ditaxis 5      11010 20
59EUPDitaxis neomexicanaNew Mexico ditaxis  1          
60EUPEuphorbia erianthabeetle spurge             
61FABAcacia greggiicatclaw             
62FABAstragalus crotalariaeSalton milk-vetch           1 
63FABLotus rigidusdesert lotus   1     12 5
64FABLotus scoparius var. brevialatusshort-winged deerweed         11 2
65FABProsopis glandulosa var. torreyanahoney mesquite        1 1 1
66FABPsorothamnus emoryiEmory's indigo-bush2    1       
67FABPsorothamnus schottiiindigo bush11  1 11   1 
68FOUFouquieria splendens ssp. splendensocotillo20205 151202055511
69GERErodium cicutarium*redstem filaree       312999999
70GERErodium texanumTexas filaree          3 3
71GRORibes indecorumwhite-flowering currant       1     
72HYDEmmenanthe penduliflora var. penduliflorawhispering bells            1
73HYDPhacelia distanscommon phacelia          30 99
74HYDPhacelia minorwild canterbury bells          1 3
75HYDPholistoma membranaceumwhite fiesta flower         2099 99
76KRAKrameria grayiwhite rhatany             
77LAMHyptis emoryidesert-lavender3992 5 105999999 99
78LOAPetalonyx thurberi ssp. thurberiThurber's sandpaper-plant             
79MALHibiscus denudatusrock hibiscus          5 10
80MALHorsfordia newberryiNewberry's velvet mallow             
81MALMalacothamnus aboriginumIndian Valley bush mallow    5 11     
82NYCAbronia villosa var. villosahairy sand-verbena             
83NYCAllionia incarnatatrailing four o'clock 20        1  
84NYCBoerhavia intermediafivewing spiderling             
85NYCBoerhavia wrightiiWright's spiderling             
86NYCMirabilis bigelovii var. retrorsawishbone plant 1        2110
87NYCMirabilis tenuilobaslender-lobed four o'clock        1510 1
88ONACamissonia boothii ssp. condensataBooth's desert primrose           2 
89ONACamissonia cardiophylla ssp. cardiophyllaheartleaf sun-cup 1           
90ONACamissonia claviformis ssp. peirsoniibrown-eyed primrose          2 1
91ONACamissonia pallida ssp. pallidapale sun-cup          11010
92ONAEpilobium canum ssp. latifoliummountain California-fuchsia             
93ONAEpilobium ciliatum ssp. ciliatumwillowherb             
94ONAOenothera elata ssp. hirsutissimaHooker's evening-primrose          2 1
95PAPEschscholzia minutiflora ssp. minutiflorasmall-flowered poppy          1 50
96PAPEschscholzia parishiiParish's poppy            5
97PLAPlantago ovatadesert plantain           5 
98PLAPlatanus racemosawestern sycamore             
99POLEriogonum elongatum var. elongatumlong-stemmed buckwheat             
100POLEriogonum fasciculatum var. polifoliumCalifornia buckwheat 1          1
101POLEriogonum inflatumdesert trumpet231 3   212  
102POLEriogonum wrightii var. nodosumWright's buckwheat 22   11111  
103RHAZiziphus parryi var. parryilotebush          15 5
104ROSPrunus fremontiidesert apricot       3  101010
105SALSalix exiguanarrowleaf willow        115 20
106SCRMimulus cardinalisscarlet monkeyflower             
107SCRPenstemon clevelandii var. connatusSan Jacinto beardtongue            1
108SOLDatura discolordesert thornapple 1           
109SOLDatura wrightiisacred datura             
110SOLLycium andersoniiAnderson's desert-thorn        425 5
111SOLNicotiana obtusifoliadesert tobacco 1       11 1
112SOLPhysalis crassifoliathick-leaved ground cherry 6          1
113SOLSolanum douglasiiwhite nightshade         12 1
114VISPhoradendron californicumdesert mistletoe   2    223 2
115ZYGFagonia laevisCalifornia fagonia           5 
116ZYGFagonia pachyacanthasticky fagonia             
117ZYGLarrea tridentatacreosote bush         2111
118LILAgave desertidesert agave 1    11    1
119POAAristida adscensionissix-weeks three-awn 1           
120POABouteloua aristidoides var. aristidoidesneedle grama 1           
121POABouteloua barbata var. barbatasix-weeks grama             
122POAPennisetum setaceum*fountain grass        103099 99
123POAPleuraphis rigidabig galleta          1 2

Links to Other Webpages, etc. on Anza-Borrego Desert State Park Blooms

DesertUSA Anza-Borrego Desert State Park Wildflower Reports For 2010

Anza-Borrego Desert Wildflowers: Where and When to Look from the Anza-Borrego Desert Natural History Association

Anza-Borrego Desert State Park Wildflower Hotline: (760)767-4684. "Information on this recording is updated regularly."

Anza-Borrego Foundation and Institute Wildflowers (link didn't work on 9 February 2009)

Theodore Payne Wildflower Hotline (Reports begin in March 2010)

Carol Leigh's California Wildflower Hotsheet

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Copyright © 2008-2010 by Tom Chester.
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Updated 20 February 2010.