Cycladenia

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.[1][2][3] 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.[4] 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.

Cycladenia
Cycladenia humilis var. jonesii

Vulnerable  (NatureServe)
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Gentianales
Family: Apocynaceae
Subfamily: Apocynoideae
Tribe: Odontadenieae
Genus: Cycladenia
Benth.
Species:
C. humilis
Binomial name
Cycladenia humilis

Nomenclature

Cycladenia humilis Benth., Pl. Hartw. 323. 1849.[5]

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.[6] = Cycladenia jonesii Eastw., Leafl. W. Bot. 3(7): 159–160. 1942.[7]
  • Cycladenia humilis var. tomentosa (A. Gray) A. Gray, Syn. Fl. N. Amer. 2(1): 400. 1886.[8] = Cycladenia tomentosa A. Gray, Bot. California 1: 474. 1876.[9]
  • Cycladenia humilis var. venusta (Eastw.) Woodson ex Munz, Man. S. Calif. Bot. 379. 1935.[10] = Cycladenia venusta Eastw., Bull. Torrey Bot. Club 29(2): 77. 1902.[11]

References
  1. Kew World Checklist of Selected Plant Families
  2. Biota of North America Paogram 2013 county distribution map
  3. McLaughlin, S.P. 1993. Apocynaceae A.L. Juss, Dogbane Family. Journal of the Arizona-Nevada Academy of Science 27:164-168.
  4. USFWS. Rule to determine Cycladenia humilis var. jonesii (Jones Cycladenia) to be Thr. Species. Federal Register May 5, 1986.
  5. Bentham. G. Plantas Hartwegianas imprimis Mexicanas 323. 1849.
  6. S.L. Welsh & N.D. Atwood, Great Basin Naturalist 35(4): 333. 1976.
  7. Eastwood, A. 1942. Leaflets of Western Botany 3(7): 159–160.
  8. A. Gray. 1886. Synoptical Flora of North America 2(1): 400.
  9. A. Gray. 1876. Geological Survey of California, Botany 1: 474.
  10. Munz. P.A. 1935. Manual of Southern California Botany 379.
  11. Eastwood, A. 1902. Bulletin of the Torrey Botanical Club 29(2): 77.


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