Asclepias solanoana
Common Name: serpentine milkweed
Family: Apocynaceae
Element Code: PDASC021R0
Full Name: Asclepias solanoana Woodson

2006 Aaron Schusteff
Biology Glossary
Rarity Status Glossary
Occurrence Data from CDFW
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences:
  • Element Occurrence Ranks:
    A B C D X U
  • Population Status:
    >20 yrs
    <=20 yrs
  • Presence:
    Present Extant Possibly Extirpated Presumed Extirpated
Notes Glossary
  • Not common where it occurs. Threatened by grazing, vehicles, logging, mining, and geothermal development. Potentially threatened by renewable energy development. See Proceedings of the American Academy of Arts and Sciences 10:76 (1874) for original description, and MadroƱo 24(3):159-177 (1977) for information on floral ecology.
  • To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
  • Date Added: 1974-01-01
  • Last Update: 2014-09-02
Location Glossary
  • Elevation: 230 - 1860 meters
  • California Endemic: yes
  • Other States:
  • California Counties and Islands:   name (code)
    Colusa (COL),  Glenn (GLE),  Lake (LAK),  Mendocino (MEN),  Napa (NAP),  Shasta (SHA),  Sonoma (SON),  Tehama (TEH),  Trinity (TRI),  Yolo (YOL)
  • Quads:   name (DWR code) USGS code
    Detert Reservoir (517A) 3812265,  Jimtown (518A) 3812267,  Fort Ross (519C) 3812352,  Cazadero (519D) 3812351,  Jericho Valley (532C) 3812274,  Knoxville (532D) 3812273,  Whispering Pines (533C) 3812276,  The Geysers (534D) 3812277,  Hough Springs (548A) 3912225,  St. John Mtn. (564B) 3912246,  Fouts Springs (564C) 3912236,  Gilmore Peak (564D) 3912235,  Crockett Peak (565A) 3912247,  Potato Hill (565D) 3912237,  Chrome (580A)? 3912265,  Elk Creek (580D)? 3912255,  Plaskett Meadows (581A) 3912267,  Plaskett Ridge (581B) 3912268,  Hull Mountain (581C) 3912258,  Riley Ridge (596B) 3912286,  Hall Ridge (596C) 3912276,  North Yolla Bolly (613B) 4012228,  Solomon Peak (613C) 4012218,  Black Rock Mtn. (614A) 4012321,  Four Corners Rock (614C) 4012312,  Wrights Ridge (614D) 4012311,  Platina (631C) 4012238,  Wildwood (632A) 4012341,  Dubakella Mtn. (632B) 4012342,  Smoky Creek (632C) 4012332,  Pony Buck Peak (632D) 4012331,  Naufus Creek (633A) 4012343,  Lewiston (649A) 4012267,  Bully Choop Mtn. (649D) 4012257
  • Notes:
      Definitions of codes preceding a county and/or quad:
      * Presumed extirpated
      ? Uncertain about distribution or identity
      ?* Uncertain about distribution, but presumed extirpated if once present
      (?) Occurrence confirmed, but possibly extirpated
      Species may be present in other areas where conditions are favorable. This data should NOT be substituted for pre-project review or for on-site surveys.
Includes unprocessed quads for CRPR 3 and 4 plants; unprocessed location data has not been quality controlled and may contain errors.
Presumed Extant Presumed Extirpated or Unknown 1575
Links to Leading Resources of Taxon Information
Suggested Citation
California Native Plant Society, Rare Plant Program. . Inventory of Rare and Endangered Plants of California (online edition, v8-03). Website [accessed ].

3812265=Detert Reservoir (517A) 3812265;3812267=Jimtown (518A) 3812267;3812352=Fort Ross (519C) 3812352;3812351=Cazadero (519D) 3812351;3812274=Jericho Valley (532C) 3812274;3812273=Knoxville (532D) 3812273;3812276=Whispering Pines (533C) 3812276;3812277=The Geysers (534D) 3812277;3912225=Hough Springs (548A) 3912225;3912246=St. John Mtn. (564B) 3912246;3912236=Fouts Springs (564C) 3912236;3912235=Gilmore Peak (564D) 3912235;3912247=Crockett Peak (565A) 3912247;3912237=Potato Hill (565D) 3912237;3912265=Chrome (580A)? 3912265;3912255=Elk Creek (580D)? 3912255;3912267=Plaskett Meadows (581A) 3912267;3912268=Plaskett Ridge (581B) 3912268;3912258=Hull Mountain (581C) 3912258;3912286=Riley Ridge (596B) 3912286;3912276=Hall Ridge (596C) 3912276;4012228=North Yolla Bolly (613B) 4012228;4012218=Solomon Peak (613C) 4012218;4012321=Black Rock Mtn. (614A) 4012321;4012312=Four Corners Rock (614C) 4012312;4012311=Wrights Ridge (614D) 4012311;4012238=Platina (631C) 4012238;4012341=Wildwood (632A) 4012341;4012342=Dubakella Mtn. (632B) 4012342;4012332=Smoky Creek (632C) 4012332;4012331=Pony Buck Peak (632D) 4012331;4012343=Naufus Creek (633A) 4012343;4012267=Lewiston (649A) 4012267;4012257=Bully Choop Mtn. (649D) 4012257