Checklist » Asteraceae » Helianthella uniflora var. douglasii
Last updated 11/19/2008 by David Giblin.
Helianthella uniflora (Nutt.) Torr. & A. Gray var. douglasii (Torr. & A. Gray) W.A. Weber[FNA20, HC, HC2]
Douglas helianthella, false sunflower

Publication: Fl. N. Amer. 2: 334.

Origin: Native

selected vouchers: WTU

Notes: FNA20: "Two infraspecific taxa within Helianthella uniflora may be distinguished; they have been named at varietal rank.

Variety douglasii has stems hirsute; involucres (15–)20–25(–30) mm diam.; outer phyllaries rarely elongated, margins ciliate, abaxial faces sparsely puberulent; ray laminae 30–40 mm; and 2n = 30. It grows in grasslands in the northern Rocky Mountains and on the east side of the Cascade Range (B.C.; Idaho, Oreg., Wash.) at 300–2500 m where it flowers May–Jul."

See Weber (1952)

References:

» Weber, W.A. 1952. The genus Helianthella (Compositae). American Midland Naturalist 48: 1-35.
Synonyms & Misapplied Names:
(none)