CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record micropus_amphibolus - Mon, Dec. 6, 2021, 21:03 ET b
Micropus amphibolus
common nameMt. Diablo cottonweed
CalPhotos image
more photos
© 2008 Aaron Arthur  Follow image link for photo data.
life formannual herb
CA Rare Plant Rank
List 3.2
LIST 3: We need more information about this plant (Review List).
     0.2: Fairly endangered in California
state rank
S3S4   S3S4: Intermediate between S3 and S4
global rank
G3G4   G3G4: Intermediate between G3 and G4
Where did the "RED" code go?
CA state listingNone  
federal listingNone  
where found
MAPS - Use v8 link below.

Topographic quads (33):
San Marcos Pass (168D) 3411957, Zaca Creek (169B) 3412062, Zaca Lake (194D) 3412071, Seaside (366D) 3612157, Soquel (387B) 3612188, Laurel (407C) 3712118, Davenport (408C) 3712212, Felton (408D) 3712211, San Jose East (427D) 3712137, Palo Alto (428B) 3712242, Cedar Mountain (445D) 3712155, Walnut Creek (465A) 3712281, Briones Valley (465B) 3712282, Oakland East (465C) 3712272, San Quentin (466B) 3712284, San Francisco North (466C) 3712274, San Rafael (467A) 3712285, Bolinas (467B) 3712286, Cordelia (482B) 3812222, Petaluma River (484A) 3812225, Novato (484D) 3812215, Yountville (500A) 3812243, Sonoma (500C) 3812234, Glen Ellen (501D) 3812235, St. Helena (516C) 3812254, Mark West Springs (517C) 3812256, Calistoga (517D) 3812255, Geyserville (518B) 3812268, Kelseyville (534A) 3812287, Highland Springs (534B) 3812288, The Geysers (534D) 3812277, Wilbur Springs (547C) 3912214, Lucerne (549D) 3912217
quad data info

Counties, states, regions:
Alameda (ALA), Contra Costa (CCA), Colusa (COL), Lake (LAK), Monterey (MNT), Marin (MRN), Napa (NAP), Santa Barbara (SBA), Santa Clara (SCL), Santa Cruz (SCR), San Joaquin (SJQ), Solano (SOL), Sonoma (SON)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Broadleafed upland forest (BUFrs)
•Chaparral (Chprl)
•Cismontane woodland (CmWld)
•Valley and foothill grassland (VFGrs)/rocky
blooming period Mar-May  
elevation range45 - 825 meters
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.
full nameMicropus amphibolus Gray
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  MIAM2 Element Code  PDAST6D030
CalFlora species this taxon    CalFlora genus related taxa
Jepson Online Jepson Interchange  Jepson Manual and other resources
Google search
search Google CNPS website    search Google entire web

Suggested citation: California Native Plant Society (CNPS). 2018. Inventory of Rare and Endangered Plants (online edition, v7-18mar). California Native Plant Society. Sacramento, CA. Accessed on Mon, Dec. 6, 2021 from

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