Psilostrophe cooperi
Pittonia 2: 176. 1891.
Basionym: Riddellia cooperi A. Gray Proc. Amer. Acad. Arts 7: 358. 1868
Revision as of 20:33, 16 December 2019 by FNA>Volume Importer
Shrubs or subshrubs, (15–)25–30(–50+) cm. Stems pannose (white). Heads borne singly. Peduncles 35–60(–80+) mm. Involucres 6–8 mm. Rays 3–6; laminae (8–)12–20 mm, spreading to reflexed in fruit. Disc florets (6–)10–17(–25). Cypselae usually glabrous, sometimes gland-dotted; pappi of 4–6 oblong to ± lanceolate scales 2–2.5 mm. 2n = 32.
Phenology: Flowering (Feb–)Apr–Jun(–Dec).
Habitat: Creosote-bush scrub, sandy washes
Elevation: 100–2100 m
Distribution
Ariz., Calif., Nev., Utah, Mexico (Baja California, Sonora).
Discussion
Selected References
None.
Lower Taxa
None.