''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 The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

. Collections have mostly been from

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

, although the species has also been reported from

Utah Utah is a landlocked state in the Mountain states, Mountain West subregion of the Western United States. It is one of the Four Corners states, sharing a border with Arizona, Colorado, and New Mexico. It also borders Wyoming to the northea ...

and

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, mostly on

gypsum Gypsum is a soft sulfate mineral composed of calcium sulfate Hydrate, 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, drywall and blackboard or sidewalk ...

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 cycladenia, 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 A fish (: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and the more common jawed fis ...

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