Species Details

Asclepias solanoana

serpentine milkweed

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Classification

Scientific Name: Asclepias solanoana Woodson
Common Name: serpentine milkweed
Family:	Apocynaceae
Element Code:	PDASC021R0
USDA Plants Symbol:	ASSO
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	4.2
Fed List:	None
State List:	None
Global Rank:	G3
State Rank:	S3
Other Status:	SB_CalBG/RSABG
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2023-05-02

Ecology and Life History

Lifeform: perennial herb

Blooming Period: May-Jul(Aug)

Elevation:
230 - 1860 meters
755 - 6105 feet

General Habitats:

Chaparral
Cismontane woodland
Lower montane coniferous forest

Microhabitat Details:

Microhabitat:

Serpentine

Notes

Notes: Not common where it occurs.
Threats: Threatened by grazing, vehicles, logging, mining, and geothermal development. Potentially threatened by renewable energy development.
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)
Colusa (COL), Glenn (GLE), Lake (LAK), Mendocino (MEN), Napa (NAP), Shasta (SHA), Sonoma (SON), Tehama (TEH), Trinity (TRI)

Quads: Name (Quad Code)
Benmore Canyon (3912215), Black Rock Mtn. (4012321), Bully Choop Mtn. (4012257), Cazadero (3812351), Crockett Peak (3912247), Detert Reservoir (3812265), Dubakella Mtn. (4012342), Fort Ross (3812352), Four Corners Rock (4012312), Fouts Springs (3912236), Gilmore Peak (3912235), Hall Ridge (3912276), Hough Springs (3912225), Hull Mountain (3912258), Jericho Valley (3812274), Jimtown (3812267), Knoxville (3812273), Leesville (3912224), Lewiston (4012267), Naufus Creek (4012343), North Yolla Bolly (4012228), Plaskett Ridge (3912268), Platina (4012238), Pony Buck Peak (4012331), Potato Hill (3912237), Riley Ridge (3912286), Smoky Creek (4012332), Solomon Peak (4012218), St. John Mtn. (3912246), The Geysers (3812277), Whispering Pines (3812276), Wilbur Springs (3912214), Wildwood (4012341), Wrights Ridge (4012311)

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

Original Description:	Proceedings of the American Academy of Arts and Sciences 10:76 (1874)
Species Account:	Asclepias solanoana profile for potential Species of Conservation Concern evaluation (2021).
Other:	Madroño 24(3):159-177 (1977)