CNPS

CNPS Rare Plant Inventory

Species Details

Micropus amphibolus

Mt. Diablo cottonweed

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Photo of Micropus amphibolus
© 2008 Aaron Arthur 		Photo of Micropus amphibolus
© 2008 Aaron Arthur 		Photo of Micropus amphibolus
2014 Russell Huddleston

  Classification

Scientific Name:
Micropus amphibolus Gray
Common Name:
Mt. Diablo cottonweed
Family: Asteraceae
Element Code: PDAST6D030
USDA Plants Symbol: MIAM3
Synonyms/Other Names:

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

  Occurrence Data from the CNDDB

Total Occurrences: 0
Element Occurrence Ranks:
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)
Quads: Name (Quad Code)
Ano Nuevo (3712213), Cedar Mtn. (3712155), Felton (3712211), 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
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

Suggested Citation:
California Native Plant Society, Rare Plant Program. 2023. Rare Plant Inventory (online edition, v9.5). Website https://www.rareplants.cnps.org [accessed 29 November 2023].