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''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 )〕〔(Biota of North America Paogram 2013 county distribution map )〕〔McLaughlin, S.P. 1993. Apocynaceae A.L. Juss, Dogbane Family. Journal of the Arizona-Nevada Academy of Science 27:164-168.〕 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.〔Bentham. G. Plantas Hartwegianas imprimis Mexicanas 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.〔S.L. Welsh & N.D. Atwood, Great Basin Naturalist 35(4): 333. 1976.〕 = ''Cycladenia jonesii'' Eastw., Leafl. W. Bot. 3(7): 159–160. 1942.〔Eastwood, A. 1942. Leaflets of Western Botany 3(7): 159–160.〕 *''Cycladenia humilis'' var. ''tomentosa'' (A. Gray) A. Gray, Syn. Fl. N. Amer. 2(1): 400. 1886.〔A. Gray. 1886. Synoptical Flora of North America 2(1): 400.〕 = ''Cycladenia tomentosa'' A. Gray, Bot. California 1: 474. 1876.〔A. Gray. 1876. Geological Survey of California, Botany 1: 474.〕 *''Cycladenia humilis'' var. ''venusta'' (Eastw.) Woodson ex Munz, Man. S. Calif. Bot. 379. 1935.〔Munz. P.A. 1935. Manual of Southern California Botany 379.〕 = ''Cycladenia venusta'' Eastw., Bull. Torrey Bot. Club 29(2): 77. 1902.〔Eastwood, A. 1902. Bulletin of the Torrey Botanical Club 29(2): 77.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cycladenia」の詳細全文を読む スポンサード リンク
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