Difference between revisions of "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.
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Latest revision as of 18:29, 6 November 2020

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 +