Hymenoxys richardsonii var. floribunda

(A. Gray) K. F. Parker

Madroño 10: 159. 1950.

Common names: Colorado rubberweed olivaceous bitterweed
Endemic
Basionym: Actinella richardsonii var. floribunda A. Gray Mem. Amer. Acad. Arts, n. s. 4: 101. 1849
Treatment appears in FNA Volume 21. Treatment on page 441. Mentioned on page 435, 436.

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

V21-1104-distribution-map.gif

Ariz., Colo., N.Mex., Tex., Utah.

Discussion

Selected References

None.

Lower Taxa

None.
Mark W. Bierner +
(A. Gray) K. F. Parker +
Actinella richardsonii var. floribunda +
Colorado rubberweed +  and olivaceous bitterweed +
Ariz. +, Colo. +, N.Mex. +, Tex. +  and Utah. +
(1600–)1800–2700(–3400) m +
Roadsides, open areas, edges of forests +
Flowering (May–)Jul–Aug(–Oct). +
Dugaldia +  and Plummera +
Hymenoxys richardsonii var. floribunda +
Hymenoxys richardsonii +
variety +