Cuscuta occidentalis Millsp.

Native to:

California, Colorado, Idaho, Mexico Northwest, Nevada, Oregon, Utah, Washington, Wyoming

POWO follows these authorities in accepting this name:

• Costea, M. in Costea, Mihai (2011-Sept-30). Cuscuta names missing. personal communication (email) 30 Sept. 2011: "Cuscuta names missing".
• Cronquist, A. et al. in Cronquist, A., et al. (1984). Convolvulaceae. Intermountain Flora, vascular plants of the intermountain west, U.S.A. 4: 74-84. New York Botanical garden.
• Flora of North America Editorial Committee (2023). Flora of North America North of Mexico 14: 1-505. Oxford University Press, New York, Oxford.
• Hitchcock, C.L. & A. Cronquist in Hitchcock, C.L. & A. Cronquist (1991). Convolvulaceae. Flora of the Pacific Northwest: 363-366. Univ. Washington Press.
• Wiggins, I.L. in Wiggins, I.L. (1980). Convolvulaceae. Flora of Baja California: 373-385. Stanford Univ. Press.
• Yuncker, T.G. (1932). The genus Cuscuta. Memoirs of the Torrey Botanical Club 18: 113-331. New York Botanical Garden.

An alternative taxonomy had been proposed by the following authorities:

• Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Cuscuta californica var. breviflora.]
• Kartesz, J.T. in Kartesz, J.T. (1994). Convolvulaceae, Cuscutaceae. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland 1: 217-221-& 227-228. Timber Press. [Cited as Cuscuta californica var breviflora.]

Kew Backbone Distributions

• Cronquist, A. et al. in Cronquist, A., et al. (1984). Convolvulaceae. Intermountain Flora, vascular plants of the intermountain west, U.S.A. 4: 74-84. New York Botanical garden.
• Hitchcock, C.L. & A. Cronquist in Hitchcock, C.L. & A. Cronquist (1991). Convolvulaceae. Flora of the Pacific Northwest: 363-366. Univ. Washington Press.
• Wiggins, I.L. in Wiggins, I.L. (1980). Convolvulaceae. Flora of Baja California: 373-385. Stanford Univ. Press.