Chaenactis douglasii |
Chaenactis suffrutescens |
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chaenactis, Douglas' dusty maidens, Douglas' dustymaiden, hoary chaenactis, hoary false-yarrow, hoary pincushion |
Shasta chaenactis, Shasta 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. | Perennials or subshrubs (10–)25–45(–60) cm (sometimes cespitose, not matted); proximal indument (especially stems) persistent, whitish, densely lanuginose or pannose. | ||||
Stems | 1–25+, erect to spreading. |
mostly 5–15+, usually 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. |
usually ± cauline, sometimes ± basal, 5–10 cm; largest blades lance-ovate or deltate, ± plane, 1–2-pinnately lobed; primary lobes mostly 2–5 pairs, ± remote, ultimate lobes ± plane. |
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Peduncles | mostly ascending to erect, 1–10 cm. |
ascending to erect, (5–)10–20 cm. |
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Involucres | obconic to ± hemispheric. |
± cylindric. |
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Corollas | 5–8 mm. |
8.5–10 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 14–18 mm; outer predominantly stipitate-glandular (other indument none or sparse), 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. |
7–9 mm; pappi: longest scales 7–9 mm. |
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2n | = 12. |
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Chaenactis douglasii |
Chaenactis suffrutescens |
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Phenology | Flowering May–early Sep. | |||||
Habitat | Loose scree, sand, rocky soils, slopes, drainages, usually on serpentine or other ultramafic deposits | |||||
Elevation | 700–2300 m (2300–7500 ft) | |||||
Distribution |
AZ; CA; CO; ID; MT; ND; NM; NV; OR; SD; UT; WA; WY; AB; BC
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CA |
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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 suffrutescens is known from the southern and eastern Klamath Ranges and northern Coast Ranges of Trinity and Siskiyou counties (nearly to Oregon). It is sometimes cultivated in rock gardens and may be found outside its native range. Small forms of C. suffrutescens from southern Trinity County approach C. nevadensis in habit (see discussion there). (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 | C. suffrutescens var. incana | ||||
Name authority | (Hooker) Hooker & Arnott: Bot. Beechey Voy., 354. (1839) | A. Gray: Notes Compositae, 100. (1880) | ||||
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