Chaenactis douglasii |
Chaenactis carphoclinia |
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chaenactis, Douglas' dusty maidens, Douglas' dustymaiden, hoary chaenactis, hoary false-yarrow, hoary pincushion |
pebble pincushion, straw-bed pincushion |
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Habit | 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. | Plants (5–)10–30(–60) cm. | ||||||||
Stems | 1–25+, erect to spreading. |
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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. |
basal (often withering) and, usually, cauline, 1–6(–10) cm; largest blades ± 3-dimensional, not to somewhat succulent; primary lobes mostly 2–7(–10) pairs, ultimate lobes ± crowded to remote, antrorse, linear, terete. |
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Peduncles | mostly ascending to erect, 1–10 cm. |
2–6 cm. |
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Involucres | obconic to ± hemispheric. |
obconic to ± cylindric or hemispheric, mostly 5–10 mm diam. |
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Receptacles | paleae (0–)3–10+ (persistent, ± phyllary-like, apices visible among mature floret buds). |
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Corollas | 5–8 mm. |
4–6 mm. |
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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. |
longest 7–10 mm, ± granular-glandular and villous; apices (all or inner) erect to incurved, usually reddish, acuminate, aristate, terete. |
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Heads | 1–25+ per stem. |
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Cypselae | 5–8 mm (usually sparsely glandular amidst other indument); pappi: longest scales 3–6 mm. |
± terete, 3–4.5 mm; pappi usually of 4(–5) scales, longest 3–5 mm. |
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Chaenactis douglasii |
Chaenactis carphoclinia |
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Distribution |
AZ; CA; CO; ID; MT; ND; NM; NV; OR; SD; UT; WA; WY; AB; BC
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AZ; CA; NM; NV; UT; nw Mexico
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Discussion | Varieties 2 (2 in the flora). Chaenactis douglasii is widespread and variable (see discussion under var. douglasii). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). Though occasionally suspected (P. Stockwell 1940), there are no confirmed natural or artificial hybrids between Chaenactis carphoclinia and any other member of the genus. The presence of paleae on the receptacle of C. carphoclinia is unique in Chaenactis. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 21, p. 405. | FNA vol. 21, p. 402. | ||||||||
Parent taxa | ||||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Hymenopappus douglasii, Macrocarphus douglasii | |||||||||
Name authority | (Hooker) Hooker & Arnott: Bot. Beechey Voy., 354. (1839) | A. Gray: in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 94. (1859) | ||||||||
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