Comments On the 2006 Checklist of the Vascular Plants of San Diego County (fourth edition)

Table of Contents

New Native Taxa Added in the 2006 Checklist Not Found Elsewhere in My Southern California Database
Taxa Deleted in the 2006 Checklist
Taxa In Nearby Areas Not In the Checklist
Deletions to the Checklist


This page is very incomplete, and serves for now just to give a few comments on this Checklist which expand upon the review published in Crossosoma in late 2006. I hope to do a proper job of commenting on this flora in Fall / Winter 2006.

New Native Taxa Added in the 2006 Checklist Not Found Elsewhere in My Southern California Database

This is a partial list of new native taxa added in the 2006 Checklist that are not found in any of my 93 Plant Trail Guides or in any of the 65 floras I've digitized. These species are thus significant and surprising additions to the San Diego County Flora, since they are found almost nowhere else in southern California. (Note that I haven't digitized every flora for southern California, and many areas, such as Imperial County, don't have floras.) I also give the Jepson Manual distribution for those taxa.

Note that there are many more new native taxa added in the Checklist; these are just the most remarkable ones. This list is partial because I haven't completely digitized the 2006 Checklist yet (10-20% is yet to be done).

Also note that there are many more taxa native to San Diego County found only in the San Diego County Checklist in my database; this is only the list of such taxa appearing for the first time in the 2006 Checklist.

There are at least three categories of sources in this list:

In the following, the Jepson Manual name is given first, with the Checklist name in parentheses if it is different.

TaxonJepson Manual Distribution
Total Surprises
Artemisia pycnocephalaCCo
Astragalus curtipesn ChI; s CCo
Brickellia aff. knappianaRARE; n&e DMtns (Panamint, n Kingston mtns)
Carex obispoensisRARE; s CCo (San Luis Obispo Co.)
Cicuta maculata var. angustifoliaSnBr, GB
Ceanothus thyrsiflorusSCoRo
Gnaphalium canescens ssp. canescens (Pseudognaphalium canescens)DMtns
Helianthus niveus ssp. tephrodesENDANGERED; s DSon (Imperial Co.)
Lindernia dubia var. anagallideaSN, GV
Lipocarpha occidentalisPR
Pentagramma triangularis ssp. nov. 
Not Unexpected
Amsinckia lycopsoidesCA-FP
Aristida purpurea var. fendlerianaSnBr, PR, SNE, Dmoj
Artemisia tridentata ssp. vaseyanaCaRH, SNH, TR, n SNE, W&I
Astragalus nutansDson
Chamaesyce abramsianaDSon
Elatine rubellaCA
Eriophyllum ambiguum var. paleaceumD
Lepidium densiflorum var. densiflorumCaR, GV, Dmoj, expected elsewhere
Parietaria pensylvanicaCA-FP
Subspecies "Out of Range"
Lessingia filaginifolia var. californica (Corethrogyne filaginifolia var. californica)CW
Hazardia squarrosa var. squarrosaSCoRo
Lonicera subspicata var. subspicataWTR
Phacelia ramosissima var. subglabraSNH, Teh, SnGb, SNE

Taxa Deleted in the 2006 Checklist

This list is incomplete, especially for non-native species (marked with an asterisk); see note above.

Aster chilensis 
Boerhavia erecta 
Boerhavia triquetra 
Brodiaea jolonensisAll southern California specimens are misidentified B. terrestris ssp. kernensis; see Brodiaea jolonensis Doesn't Exist In Southern California
Camissonia campestris ssp. campestris 
Camissonia claviformis ssp. yumae 
Ceanothus integerrimus 
Claytonia rubra ssp. depressa 
Cuscuta salina var. salina 
*Datura stramonium 
Ditaxis serrata 
Erigeron breweri var. covillei 
Eriogonum ordii 
Eriophyllum ambiguum var. ambiguum 
Fraxinus jonesii 
Hordeum depressum 
Juncus effusus var. exiguusSpecimens previously recognized as this taxon now recognized as J.e. var. austrocalifornicus
Lepidium densiflorum var. pubicarpum 
Linanthus floribundus ssp. hallii (Leptosiphon floribundus ssp. hallii) 
Lonicera interrupta 
Ludwigia palustris 
Lycium brevipes var. hassei 
Mentzelia multiflora ssp. longiloba 
Mentzelia nitens 
Mentzelia pectinata 
Microseris douglasii ssp. douglasii 
Monardella hypoleuca ssp. hypoleucaNot in our county; specimens identified as this subspecies attributed to a new taxon, currently being described by M. Elvin and A. Sanders
Nemophila rotata 
Oenothera caespitosa ssp. marginata 
Plectritis congesta 
Polystichum imbricans ssp. imbricans 
Quercus XgrandidentataThis named hybrid was previously misapplied to Q. dumosa X Q. engelmannii
Stephanomeria virgata ssp. virgata 
Verbena gooddingii 

The Checklist also reveals that Ditaxis californica may just be a glabrous form of D. neomexicana.

Taxa With Deleted Subspecies or Varieties in the 2006 Checklist

This list is incomplete; see note above.

Danthonia californica 
Eriogonum inflatumThe varieties are bogus; see note
Eriogonum trichopes 
Ferocactus cylindraceus 
Loeflingia squarrosa 
Silene verecunda 

Taxa In Nearby Areas Not In the Checklist

See list of Taxa Approaching the Desert Area of San Diego County.

Deletions to the Checklist

The vouchers labeled as Brodiaea coronaria ssp. coronaria from San Diego County are specimens of B. terrestris ssp. kernensis that were never annotated with their correct current determination. Wayne Armstrong and I annotated those vouchers on 20 June 2006.

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Copyright © 2006 by Tom Chester
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Comments and feedback: Tom Chester
Last update: 15 August 2006