Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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ASCLEPIADACEAE

MILKWEED FAMILY

Carol A. Hoffman

Annual, perennial herb, shrub, vine; sap milky
Leaves simple, generally opposite or whorled; stipules 0 or small
Inflorescence: cyme, terminal or axillary, umbel- or raceme-like, or flower solitary
Flower bisexual, radial; sepals 5, generally reflexed; petals 5, generally reflexed or spreading; stamens 5, fused to form filament column and anther head, generally with 5 elaborate appendages on outside of filament column, pollen removed in pairs of massive sacs; ovaries 2, superior, free, style tips generally fused into massive pistil head surrounded by anther head
Fruit: follicle (1 ovary generally aborts)
Seeds many, ± flat, with tuft of silky hairs
Genera in family: 50–250 genera, 2000–3000 species: especially tropical, subtropical South America, s Africa; ornamental (Asclepias, Hoya, Stapelia). Cardiac glycosides produced by some; used as arrow poisons, in medicine to control heart contraction, and by some insects for defense
Recent taxonomic note: Recently treated to be included within Apocynaceae

SARCOSTEMMA

CLIMBING MILKWEED

Perennial, shrub
Stem twining (elsewhere sometimes prostrate to ± erect)
Leaves opposite; blade often linear to narrowly lanceolate or hastate
Inflorescence axillary, often umbel-like
Flower: corolla generally ± spreading to ± erect, with ring of tissue at base; filament-column appendages free, ± spheric, attached to base of filament column, projections hollow; pistil head ± conic, 2-lobed, or both
Fruit generally erect, narrowly fusiform to narrowly ovoid, with fine longitudinal grooves
Species in genus: ± 34 species: North America, Africa to Australia
Etymology: (Greek: fleshy crown, from sac-like filament-column appendages)
Reference: [Holm 1950 Ann Missouri Bot Gard 37:477–560]

Native

S. hirtellum (A. Gray) R. Holm

TRAILING TOWNULA

Plant gray-green; hairs generally dense, short, erect
Leaf: blade base variously tapered
Flower: corolla white to greenish white; filament-column appendages fused to ring of tissue at base of corolla
Fruit generally 2, often spreading
Ecology: Hard desert pavement, washes
Elevation: 150–1200 m.
Bioregional distribution: Desert
Distribution outside California: Nevada, Arizona
Flowering time: Mar–May
Horticultural information: TRY.

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bioregional map for SARCOSTEMMA%20hirtellum being generated
 
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Sarcostemma hirtellum
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Overlay Consortium of California Herbaria specimen data by county on this map
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