Taxon Report

Microseris douglasii (DC.) Sch.Bip. ssp. platycarpha (Gray) Chambers

small-flowered microseris

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Taxon Summary

Microseris douglasii ssp. platycarpha, commonly known as small-flowered microseris, is a annual herb in the Asteraceae that is found in California and elsewhere. It occurs within Cismontane woodland, Coastal scrub, Valley and foothill grassland, and Vernal pools, growing at elevations from 15 to 1070 meters. Microseris douglasii ssp. platycarpha is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Microseris douglasii (DC.) Sch.Bip. ssp. platycarpha (Gray) Chambers
Common Name:	small-flowered microseris
Family:	Asteraceae
Element Code:	PDAST6E062
USDA Plants Symbol:	MIDOP
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Mar-May	Mar-May
Elevation:	15-1070 (50-3510)
General Habitats:	Cismontane woodland, Coastal scrub, Valley and foothill grassland, Vernal pools
Microhabitat:	Clay
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G4T4
State Rank:	S4
State List:	None
Fed List:	None
Other Status:	SB_CRES
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	0
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	0

Location


California Endemic: False
California Counties and Islands: Name (Code)
Los Angeles (LAX), Orange (ORA), Riverside (RIV), San Diego (SDG)
Quads: Name (Quad Code)
Alberhill (3311764), Bachelor Mtn. (3311751), Black Star Canyon (3311776), Dana Point (3311746), Del Mar (3211782), Dulzura (3211667), El Toro (3311766), Encinitas (3311713), Imperial Beach (3211751), La Jolla (3211772), La Mesa (3211771), Laguna Beach (3311757), Lake Elsinore (3311763), Lake Mathews (3311774), Las Pulgas Canyon (3311734), Morro Hill (3311733), Murrieta (3311752), National City (3211761), Otay Mesa (3211658), Pechanga (3311741), Prado Dam (3311786), Ramona (3311617), Rancho Santa Fe (3311712), Romoland (3311762), Sage (3311658), San Clemente (3311745), San Clemente Island Central (3211874), San Clemente Island South (3211873), San Juan Capistrano (3311756), San Luis Rey (3311723), San Marcos (3311722), San Vicente Reservoir (3211688), Santa Catalina East (3311833), Santa Catalina North (3311844), Santa Catalina South (3311834), Santa Catalina West (3311845), Tustin (3311767), Wildomar (3311753), Winchester (3311761), Yorba Linda (3311787)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



Severely declining due to urban development. Threatened by non-native plants. See Contributions from the Dudley Herbarium 4(7):296-298 (1955) for taxonomic treatment.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 10 May 2025].