Chaenactis douglasii

(Hooker) Hooker & Arnott
Bot. Beechey Voy., 354. 1839.
Common names: Hoary pincushion Douglas’s dustymaiden
IllustratedEndemic
Basionym: Hymenopappus douglasii Hooker Fl. Bor.-Amer. 1: 316. 1833
Synonyms: Macrocarphus douglasii (Hooker) Nuttall
Treatment appears in FNA Volume 21. Treatment on page 405. Mentioned on page 403, 404, 407.

Biennials or perennials, (2–)5–50(–60) cm (rarely slightly woody or flowering first year, sometimes cespitose or ± matted); proximal indument thinning with age, grayish, mostly arachnoid-sericeous to thinly lanuginose. Stems 1–25+, erect to spreading. Leaves basal, or basal (sometimes withering) and ± cauline, (1–)2–12(–15) cm; largest blades ± elliptic or slightly lanceolate to ovate, ± 3-dimensional, usually 2-pinnately lobed; primary lobes (4–)5–9(–12) pairs, ± congested, scarcely imbricate, ultimate lobes ± involute and/or twisted. Heads 1–25+ per stem. Peduncles mostly ascending to erect, 1–10 cm. Involucres obconic to ± hemispheric. Phyllaries: longest 9–15(–17) mm; outer usually stipitate-glandular (sometimes sparsely or obscurely, rarely eglandular) and, often, arachnoid to lanuginose and, sometimes, sparsely villous, apices usually ± squarrose, pliant. Corollas 5–8 mm. Cypselae 5–8 mm (usually sparsely glandular amidst other indument); pappi: longest scales 3–6 mm.

Distribution

V21-1019-distribution-map.gif

Alta., B.C., Ariz., Calif., Colo., Idaho, Mont., N.Dak., N.Mex., Nev., Oreg., S.Dak., Utah, Wash., Wyo.

Discussion

Varieties 2 (2 in the flora).

Chaenactis douglasii is widespread and variable (see discussion under var. douglasii).

Selected References

None.

Key

1 Leaves basal (sometimes withering) and ± cauline; plants not or scarcely cespitose, not matted; stems usually 1–5(–12); heads (1–)2–25+ per stem Chaenactis douglasii var. douglasii
1 Leaves strictly basal; plants cespitose or ± matted; stems (1–)10–25+; heads 1(–2) per stem Chaenactis douglasii var. alpina
... more about "Chaenactis douglasii"
James D. Morefield +
(Hooker) Hooker & Arnott +
Hymenopappus douglasii +
Hoary pincushion +  and Douglas’s dustymaiden +
Alta. +, B.C. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, N.Dak. +, N.Mex. +, Nev. +, Oreg. +, S.Dak. +, Utah +, Wash. +  and Wyo. +
Bot. Beechey Voy., +
Illustrated +  and Endemic +
Macrocarphus douglasii +
Chaenactis douglasii +
Chaenactis sect. Macrocarphus +
species +