Hymenoxys richardsonii var. floribunda
Madroño 10: 159. 1950.
Common names: Colorado rubberweed olivaceous bitterweed
Basionym: Actinella richardsonii var. floribunda A. Gray Mem. Amer. Acad. Arts, n. s. 4: 101. 1849
Revision as of 18:46, 24 September 2019 by FNA>Volume Importer
Plants 19–34 cm. Stems (2–)5–20(–30+), glabrous or ± hairy. Leaves glabrous or sparsely hairy. Heads (30–)80–250(–300+) per plant. Involucres 7–8 × 7–9 mm. Phyllaries: outer 8–9, strongly keeled, obovate, ovate, or lanceolate, 3.5–6 mm, apices acute; inner 8–12, 3–5 mm. Ray florets 7–9; corollas 7–11 mm. Disc florets 25–50+; corollas 3–4 mm. Cypselae 2 mm; pappi of (4–)5 obovate, aristate scales 1.8–2.8 mm. 2n = 30.
Phenology: Flowering (May–)Jul–Aug(–Oct).
Habitat: Roadsides, open areas, edges of forests
Elevation: (1600–)1800–2700(–3400) m
Distribution
Ariz., Colo., N.Mex., Tex., Utah.
Discussion
Selected References
None.
Lower Taxa
None.