Taxon Details

Micropus amphibolus

Mt. Diablo cottonweed

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2014 Russell Huddleston

Taxon Summary:

Micropus amphibolus, commonly known as Mt. Diablo cottonweed, is a annual herb in the Asteraceae that is found only in California. It occurs within Broadleafed upland forest, Chaparral, Cismontane woodland, and Valley and foothill grassland, growing at elevations from 45 to 825 meters. Micropus amphibolus is ranked 3.2, Plants About Which We Need More Information, A Review List; Moderately threatened in California.

Classification

Scientific Name: Micropus amphibolus Gray
Common Name: Mt. Diablo cottonweed
Family:	Asteraceae
Element Code:	PDAST6D030
USDA Plants Symbol:	MIAM3
Synonyms/Other Names: Stylocline amphibola (Gray) J.T. Howell
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	3.2
Fed List:	None
State List:	None
Global Rank:	G3G4
State Rank:	S3S4
Other Status:	SB_UCSC
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2022-03-01

Ecology and Life History

Lifeform: annual herb

Blooming Period: Mar-May

Elevation:
45 - 825 meters
150 - 2705 feet

General Habitats:

Broadleafed upland forest
Chaparral
Cismontane woodland
Valley and foothill grassland

Microhabitat Details:

Microhabitat:

Rocky

Notes

Notes: Move to List 4? Can be confused with M. californicus. Many occurrences old; need current status information. Potentially threatened by vineyard development. See Proceedings of the American Academy of Arts and Sciences 17:214 (1882) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

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

Occurrence Data from the CNDDB

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

Occurrence Status:
Historical >20 Years	0
Recent <=20 Years	0

Presence:
Presumed Extant	0
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Lake (LAK), Marin (MRN), Monterey (MNT), Napa (NAP), San Joaquin (SJQ), Santa Cruz (SCR), Sonoma (SON)

Quads: Name (Quad Code)
Ano Nuevo (3712213), Cedar Mtn. (3712155), Davenport (3712212), Felton (3712211), Glen Ellen (3812235), Kelseyville (3812287), Laurel (3712118), Petaluma River (3812225), San Francisco North (3712274), San Miguel (3512076), Spreckels (3612156), Yountville (3812243)

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