Crossosoma 34(2), Fall-Winter 2008 
78 
Significance. First record for Los Angeles County, the third record for the state 
of California, and the northern-most known occurrence. The specimen was 
collected in an unirrigated area of a yard and was also seen in adjacent yards. The 
property owner indicated that this occurrence has been persisting there for several 
years. Based on this collection and descriptions of prior collections in California, 
Euphorbia graminea may be spreading via potted nursery stock. It is probably 
more common than presently know but may be confined to landscaped areas. 
Hemizonia mohavensis Keck (ASTERACEAE) - Riverside County. Scott D. 
White 8120 (RSA) and 8123 (RSA, SD), 22 Aug 2000; Scott D. White 8136 
(RSA, UCR), 20 Oct 2000; Scott D. White 8142 (RSA), 24 Oct 2000; Scott D. 
White 11300 (RSA), 27 Apr 2006; Scott D. White and Justin Wood 11643 (RSA, 
UCR), 13 Sep 2006. All collected south of Hemet at and around “Gibbel Flat” 
in the Santa Rosa Hills. USGS Hemet 7.5’ quad, ca. 33°42.5’ N, 116 0 56’ W; 
T5S, R1W, Sect. 25, 1800 - 2200 ft. elev. Site topography is rolling hills with 
scattered granitic outcrops; vegetation is coastal sage scrub, annual grassland, 
and open riparian shrubland along ephemeral channels. Hundreds of plants, in 
scattered microhabitat patches mostly along ephemeral channels, often with 
riparian herbs incl. Mimidus cardinalis, Stachys ajugoides, Urtica holosericea, 
and Muhlenbergia rigens. Not found in perennial seeps, but often downstream 
from seeps where no surface water was present during summer and fall field 
visits. Absent or uncommon in seemingly suitable habitat where alien grasses and 
mustards occurred at high density. 
Previous knowledge. Synonymous with Deinandra mohavensis (Keck) Baldwin 
(Baldwin 1999. Novon 9: 462-471) and treated under that name in the California 
Department of Fish and Game (2009, Special vascular plants, bryophytes, and 
lichens list http://www.dfg.ca.gov/biogeodata/cnddb/pdfs/SPPlants.pdf) and in 
the California Native Plant Society Inventory (op. cit .) where it is ranked on 
List IB. 3. Peninsular ranges, Riverside and San Diego cos. (San Jacinto Mtns., 
Anza Bench, Palomar Mtns.); historically from northern base of San Bernardino 
Mtns., San Bernardino Co. Elevational range ca. 2900 - 5200 ft, habitat and 
distribution summarized by Sanders et al. (1997, Madrono 44: 197-203). Also 
disjunct to southern Sierra Nevada (Kern Co.; Consortium of California Herbaria, 
http://ucjeps.berkeley.edu/consortium/, site accessed 31 May 2009). State-listed 
endangered since 1981. Presumed extinct until rediscovery in 1994. 
Significance. Extends elevational range about 800 feet downward, into areas 
surrounded by coastal sage scrub rather than the chaparral, oak woodland, or pine 
forests as otherwise known. Due to its late phenology, Hemizonia mohavensis is 
unlikely to be found during most botanical surveys conducted for compliance with 
