Species Details

Asclepias solanoana

serpentine milkweed

  Download Report   Calflora    eFlora    CCH    CalPhotos  
Photo of Asclepias solanoana
© 2009 Julie Kierstead Nelson
Photo of Asclepias solanoana
© 2019 Steve Matson
Photo of Asclepias solanoana
© 2019 Steve Matson
Scientific Name:
Asclepias solanoana Woodson
Common Name:
serpentine milkweed
Family: Apocynaceae
Element Code: PDASC021R0
USDA Plants Symbol: ASSO
Synonyms/Other Names:
Lifeform: perennial herb
Blooming Period: May-Jul(Aug)
230 - 1860 meters
755 - 6105 feet
General Habitats:
  • Chaparral
  • Cismontane woodland
  • Lower montane coniferous forest
Microhabitat Details:
  • Serpentine
Not common where it occurs. 
Threatened by grazing, vehicles, logging, mining, and geothermal development. Potentially threatened by renewable energy development.
Total Occurrences: 0
Element Occurrence Ranks:
0 0 0 0 0 0
Occurrence Status:
Historical >20 Years 0
Recent <=20 Years 0
Presumed Extant 0
Possibly Extirpated 0
Presumed Extirpated 0
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)
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.
Presumed Extant
Click on quad for name. Hold Shift Key to use mouse scroll wheel