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

"longest" is not a number.

... more about "Chaenactis douglasii"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +, cymiform +  and corymbiform +
indeterminate +  and determinate +
James D. Morefield +
(Hooker) Hooker & Arnott +
decurrent +
Hymenopappus douglasii +
compound +  and simple +
lobed;ovate;oblanceolate;ovate;oblanceolate;linear;deltate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
connate +  and distinct +
Hoary pincushion +  and Douglas’s dustymaiden +
actinomorphic +
white +  and pinkish or cream +
stipitate-glandular +  and hairy +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, N.Dak. +, N.Mex. +, Nev. +, Oreg. +, S.Dak. +, Utah +, Wash. +  and Wyo. +
strigose +  and densely sericeous +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
in more or less cymiform arrays +, singly +  and radiant +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
obconic;more or less hemispheric +
lobed +, less elliptic or slightly lanceolate +  and ovate +
12 cm120 mm <br />0.12 m <br /> (15 cm150 mm <br />0.15 m <br />) +
cauline +  and basal +
2 cm20 mm <br />0.02 m <br /> (?) +  and 12 cm120 mm <br />0.12 m <br /> (?) +
deltate +  and more or less lanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
dentate to pinnatifid or palmatifid +  and entire +
villous +, arachnoid +  and lanuginose +
2-carpellate +
persistent +
coroniform +
1 cm10 mm <br />0.01 m <br /> (10 cm100 mm <br />0.1 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
5 +  and 21 +
0.9 cm9 mm <br />0.009 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
mostly arachnoid-sericeous +  and thinly lanuginose +
Bot. Beechey Voy., +
bearing subulate enations +, hairy +  and bristly +
knobby;convex;more or less flat +
distinct +
10 +  and 20 +
exalbuminous +
unequal +
Illustrated +  and Endemic +
erect +  and spreading +
1 +  and 25 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Macrocarphus douglasii +
Chaenactis douglasii +
Chaenactis sect. Macrocarphus +
species +
cylindric +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +
1 cm10 mm <br />0.01 m <br /> (80 cm800 mm <br />0.8 m <br />) +
toothed +  and entire +
50 cm500 mm <br />0.5 m <br /> (60 cm600 mm <br />0.6 m <br />) +
perennial +  and biennial +
5 cm50 mm <br />0.05 m <br /> (50 cm500 mm <br />0.5 m <br />) +