Taxon Report

Microseris paludosa (Greene) J.T. Howell

marsh microseris

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Taxon Summary

Microseris paludosa, commonly known as marsh microseris, is a perennial herb in the Asteraceae that is found only in California. It occurs within Cismontane woodland, Closed-cone coniferous forest, Coastal scrub, and Valley and foothill grassland, growing at elevations from 5 to 355 meters. Microseris paludosa is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Microseris paludosa (Greene) J.T. Howell
Common Name:	marsh microseris
Family:	Asteraceae
Element Code:	PDAST6E0D0
USDA Plants Symbol:	MIPA
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Apr-Jun(Jul)	Apr-Jun(Jul)
Elevation:	5-355 (15-1165)
General Habitats:	Cismontane woodland, Closed-cone coniferous forest, Coastal scrub, Valley and foothill grassland
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_SBBG; SB_UCSC
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	38
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	7
Fair (C)	2
Poor (D)	0
None (X)	3
Unknown (U)	25

Location


California Endemic: True
California Counties and Islands: Name (Code)
Marin (MRN), Mendocino (MEN), Monterey (MNT), San Francisco (SFO), San Luis Obispo (SLO), San Mateo (SMT), Santa Cruz (SCR), Solano (SOL), Sonoma (SON)
Quads: Name (Quad Code)
Ano Nuevo (3712213), Bolinas (3712286), Cape San Martin (3512184), Cotati (3812236), Davenport (3712212), Denverton (3812128), Drakes Bay (3812218), Felton (3712211), Healdsburg (3812257), Inverness (3812217), Marina (3612167), Mark West Springs (3812256), Monterey (3612158), Piedras Blancas (3512163), Pigeon Point (3712224), Point Arena (3812386), Point Reyes NE (3812227), Salinas (3612166), San Francisco North (3712274), San Gregorio (3712234)*, San Rafael (3712285), Seaside (3612157), Sebastopol (3812247), Tomales (3812228), Two Rock (3812237), Valley Ford (3812238)

Threat List Data from the CNDDB


Threat List Total:	3
EOs with Threat Listed:	Total EOs	% of EOs
	8	21 %
Grazing	6	15%
Non-native plant impacts	1	2%
Development	1	2%

Notes



Need quads for MEN Co. Similar to M. laciniata spp. leptosepala. See Bulletin of the California Academy of Sciences 2(5):52 (1886) for original description, and Leaflets of Western Botany 5:108 (1948) for revised nomenclature.
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 13 February 2025].