Taxon Report

Psilocarphus brevissimus Nutt. var. multiflorus Cronq.

Delta woolly-marbles

Print Report

Taxon Summary

Psilocarphus brevissimus var. multiflorus, commonly known as Delta woolly-marbles, is a annual herb in the Asteraceae that is found only in California. It occurs within Vernal pools, growing at elevations from 10 to 500 meters. Psilocarphus brevissimus var. multiflorus is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Psilocarphus brevissimus Nutt. var. multiflorus Cronq.
Common Name:	Delta woolly-marbles
Family:	Asteraceae
Element Code:	PDAST7R012
USDA Plants Symbol:	PSBRM
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Jun	May-Jun
Elevation:	10-500 (35-1640)
General Habitats:	Vernal pools
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G4T3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
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: True
California Counties and Islands: Name (Code)
San Diego (SDG), Solano (SOL)
Quads: Name (Quad Code)
Dozier (3812137), San Marcos (3311722)

Threat List Data from the CNDDB


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

Notes



Does plant occur in CCA, SAC, or other counties? Similar to P. elatior. See Research Studies of the State College of Washington 18:80 (1950) for original description.
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 7 November 2025].