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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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



Perennial, shrub
Stem twining (elsewhere sometimes prostrate to erect)
Leaves opposite; blade linear to ovate
Inflorescence axillary, umbel- or raceme-like
Flower: corolla ± erect, ring of tissue at base 0; filament-column appendages 0 (elsewhere generally free); pistil head flat, conic, or with 2 lobes on top
Fruit generally erect, fusiform to narrowly ovoid
Species in genus: ± 200 species: temp, especially tropical
Etymology: (Greek: dog strangle, from ancient supposition of or use as dog poison)
Reference: [Sundell 1981 Evol Monogr 5:1–63]


C. utahense (Engelm.) Woodson


Stem slender, much-branched, < 1 m
Leaf: blade 1.5–4 cm, linear, becoming reflexed
Inflorescence umbel-like
Flower: corolla 1.5–3 mm, bell-shaped, lobes incurved, hood-like, yellow, becoming orange
Fruit 4–6 cm, with fine longitudinal grooves
Ecology: UNCOMMON. Dry, sandy or gravelly areas
Elevation: < 1000 m.
Bioregional distribution: Mojave Desert
Distribution outside California: to Utah, Arizona
Flowering time: Apr–Jun
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for CYNANCHUM%20utahense 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 Cynanchum utahense
Retrieve dichotomous key for Cynanchum
Overlay Consortium of California Herbaria specimen data by county on this map
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