Chaenactis douglasii |
Chaenactis parishii |
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chaenactis, Douglas' dusty maidens, Douglas' dustymaiden, hoary chaenactis, hoary false-yarrow, hoary pincushion |
Parish chaenactis, Parish's chaenactis |
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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. | Subshrubs, (10–)20–40(–60) cm (not cespitose or matted); proximal indument (especially of stems) persistent, whitish, densely lanuginose or pannose. | ||||
Stems | 1–25+, erect to spreading. |
mostly 5–15+, erect. |
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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. |
mostly cauline, (1–)2–5 cm; largest blades lance-ovate or deltate, ± plane, 1-pinnately lobed; lobes mostly 2–5 pairs, remote, ± plane. |
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Peduncles | mostly ascending to erect, 1–10 cm. |
ascending to erect, 2–8(–20) cm. |
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Involucres | obconic to ± hemispheric. |
± obconic. |
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Corollas | 5–8 mm. |
7–8.5 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 10–13 mm; outer predominantly arachnoid to closely lanuginose (sparsely, if at all, stipitate-glandular), apices ± squarrose, pliant. |
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Heads | 1–25+ per stem. |
mostly 1–3 per stem. |
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Cypselae | 5–8 mm (usually sparsely glandular amidst other indument); pappi: longest scales 3–6 mm. |
4–7 mm; pappi: longest scales 6–8 mm. |
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2n | = 12. |
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Chaenactis douglasii |
Chaenactis parishii |
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Phenology | Flowering May–Jul. | |||||
Habitat | Open rocky to sandy soils in low montane chaparral | |||||
Elevation | 1300–2500 m (4300–8200 ft) | |||||
Distribution |
AZ; CA; CO; ID; MT; ND; NM; NV; OR; SD; UT; WA; WY; AB; BC
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CA; Mexico (Baja California) |
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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.) |
Of conservation concern. Chaenactis parishii is sometimes cultivated in rock gardens. It is known from small, isolated populations in the higher Peninsular Ranges of Riverside and San Diego counties and adjacent Baja California. Chaenactis parishii and C. suffrutescens form a species pair well marked by the (usually) subshrubby habit, proximal indument persistent, white, felty, heads relatively large, and largest leaf blades lance-ovate to deltate. (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. 404. | ||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Chaenactis > sect. Macrocarphus | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Chaenactis > sect. Macrocarphus | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Hymenopappus douglasii, Macrocarphus douglasii | |||||
Name authority | (Hooker) Hooker & Arnott: Bot. Beechey Voy., 354. (1839) | A. Gray: Proc. Amer. Acad. Arts 20: 299. (1885) | ||||
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