''Cycladenia humilis'' is the sole member of the monotypic genus ''Cycladenia''. Known by the common name Sacramento waxydogbane, it is an uncommon plant native to the southwestern
United States. Collections have mostly been from
California, although the species has also been reported from
Utah and
Arizona, mostly on
gypsum soils.
[Kew World Checklist of Selected Plant Families]
/ref> It is found at some elevation in several mountain ranges in the region. One of the four varieties of this plant, called the Jones waxydogbane, is considered a threatened taxon.[USFWS]
Rule to determine ''Cycladenia humilis'' var. ''jonesii'' (Jones Cycladenia) to be Thr. Species.
''Federal Register'' May 5, 1986. This is a fleshy perennial herb with dull green leaves and pinkish lavender flowers. The flowers begin as rolled tubes shaped like pea pods and then open into colorful funnel-shaped blooms.
Nomenclature
''Cycladenia humilis'' Benth., Pl. Hartw. 323. 1849.
Three varieties are recognized in addition to the autonymic var. ''humilis'':
* ''Cycladenia humilis'' var. ''jonesii'' (Eastw.) S.L. Welsh & N.D. Atwood, Great Basin Naturalist 35(4): 333. 1976. = ''Cycladenia jonesii'' Eastw., Leafl. W. Bot. 3(7): 159–160. 1942.
*''Cycladenia humilis'' var. ''tomentosa'' (A. Gray) A. Gray, Syn. Fl. N. Amer. 2(1): 400. 1886. = ''Cycladenia tomentosa'' A. Gray, Bot. California 1: 474. 1876.
*''Cycladenia humilis'' var. ''venusta'' (Eastw.) Woodson ex Munz, Man. S. Calif. Bot. 379. 1935. = ''Cycladenia venusta'' Eastw., Bull. Torrey Bot. Club 29(2): 77. 1902.[Eastwood, A. 1902. Bulletin of the Torrey Botanical Club 29(2): 77.]
References
External links
USDA Plants ProfileJepson Manual TreatmentRecovery Outline for the Jones Cycladenia (cycladenia humilis var. jonesii)
Fish and Wildlife Service
Photo gallery
Odontadenieae
Monotypic Apocynaceae genera
Flora of California
Flora of Arizona
Flora of Utah
{{Apocynaceae-stub