''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

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. Collections have mostly been from

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the ...

, although the species has also been reported from

Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to its ...

and

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a U.S. state, state in the Southwestern United States. It is the list of U.S. states and territories by area, 6th largest and the list of U.S. states and territories by population, 14 ...

, mostly on

gypsum Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula . It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard or sidewalk chalk, and dr ...

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 The United States Fish and Wildlife Service (USFWS or FWS) is an agency within the United States Department of the Interior dedicated to the management of fish, wildlife, and natural habitats. The mission of the agency is "working with ot ...

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Odontadenieae Monotypic Apocynaceae genera Flora of California Flora of Arizona Flora of Utah {{Apocynaceae-stub