Taxon Details

Lessingia micradenia var. micradenia

Tamalpais lessingia

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Photo of Lessingia micradenia var. micradenia

Taxon Summary:

Lessingia micradenia var. micradenia, commonly known as Tamalpais lessingia, is a annual herb in the Asteraceae that is found only in California. It occurs within Chaparral, and Valley and foothill grassland, growing at elevations from 100 to 500 meters. Lessingia micradenia var. micradenia is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Lessingia micradenia Greene var. micradenia
Common Name: Tamalpais lessingia
Family:	Asteraceae
Element Code:	PDAST5S063
USDA Plants Symbol:	LEMIM
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G2T2
State Rank:	S2
Other Status:	SB_CalBG/RSABG; SB_USDA
CRPR Changes:
Add Date:	1994-01-01
Date Edited:	2022-02-01

Ecology and Life History

Lifeform: annual herb

Blooming Period: (Jun)Jul-Oct

Elevation:
100 - 500 meters
330 - 1640 feet

General Habitats:

Chaparral
Valley and foothill grassland

Microhabitat Details:

Microhabitat:

Roadsides (often)
Serpentine (usually)

Notes

Notes: Known from only four occurrences in the Mt. Tamalpais area. See Leaflets of Botanical Observation and Criticism 2:28 (1910) for original description, and University of California Publications in Botany 16:39-40 (1929) for taxonomic treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	4
	Total EOs	% of EOs
EOs with Threat Listed:	1	11 %
Biocides	1	11%
Erosion/runoff	1	11%
Foot traffic/trampling	1	11%
Road/trail construction/maint.	1	11%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					9
A	B	C	D	X	U
0	1	0	0	0	8

Occurrence Status:
Historical >20 Years	6
Recent <=20 Years	3

Presence:
Presumed Extant	9
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Marin (MRN)

Quads: Name (Quad Code)
Bolinas (3712286), Novato (3812215), San Geronimo (3812216), San Rafael (3712285)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory