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Asclepias solanoana
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Serpentine Milkweed
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Asclepias solanoana
  

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About Serpentine Milkweed (Asclepias solanoana) Asclepias solanoana is a rare species of milkweed known by the common names serpentine milkweed, prostrate milkweed, and solanoa. It is endemic to California, where it grows only in the North Coast Ranges north of the San Francisco Bay Area. This is a robust perennial herb producing smooth purple stems which lie prostrate along the ground. The thick leaves are arranged oppositely in pairs along the stem. The leaf has an oval or heart-shaped blade supported on a short petiole. The inflorescence is a heavy spherical cluster of flowers. Each flower has a central array of rounded hoods which are pink to brown and a corolla which is reflexed against the stalk or extends outwards.
Plant Description
Plant Type
Perennial herb

Flower Color
White, Red

Native Status
Natural Setting
Elevation ?
593' - 6696'

Annual Precip. ?
31.0" - 86.2"

Summer Precip. ?
0.42" - 1.85"

Coldest Month ?
35.9° F - 49.1° F

Hottest Month ?
53.6° F - 73.0° F

Humidity ?
0.31 vpd - 22.55 vpd

Landscaping Information
Common uses
Butterfly Gardens

Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Solanoa, Prostrate Milkweed


Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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