Erigeron poliospermus |
Erigeron poliospermus var. cereus |
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buff daisy, cushion daisy, cushion fleabane, hairy-seed daisy, hairy-seed fleabane, Kittitas fleabane, purple-cushion fleabane |
Kittitas fleabane, purple cushion fleabane |
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Habit | Perennials, 3–15 cm; taprooted, caudices simple or with relatively short and thick branches. | |||||||||
Stems | erect, sometimes branched, hirsute (hairs unequal), ± minutely glandular. |
branched at or proximal to midstem, glabrous or sparsely hirsute, densely minutely glandular; branches and basal leaves originating on elongate internodes from proximal 1–6 cm of primary stems. |
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Leaves | mostly basal (persistent; petioles prominently ciliate, hairs spreading, thick-based); blades narrowly oblanceolate to spatulate, (20–)30–80 × 2–4(–12) mm, cauline sometimes continuing distally to about midstem, margins entire, usually ciliate, sometimes coarsely so, faces sparsely to densely hirsute, sometimes minutely glandular. |
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Involucres | 5–9 × 9–20 mm. |
glabrous or sparsely hirsute, densely minutely glandular. |
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Ray florets | 15–45 or 0; corollas usually pink to bluish purple, sometimes white, 5–14 mm, laminae coiling. |
15–45. |
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Disc corollas | (3.5–)4–5.5 mm. |
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Phyllaries | in 2–3 series, sparsely to densely hirsuto-villous to hirsute, minutely glandular. |
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Heads | 1(–3) (from branches at or proximal to midstem). |
1–3. |
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Cypselae | 2.5–3 mm, 2-nerved, faces densely strigoso-sericeous (obscured); pappi: outer of setae, inner of 20–30 bristles. |
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Erigeron poliospermus |
Erigeron poliospermus var. cereus |
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Phenology | Flowering Apr–Jul. | |||||||||
Habitat | Shallow rocky soil, sagebrush plains | |||||||||
Elevation | 200–600 m (700–2000 ft) | |||||||||
Distribution |
ID; OR; WA; BC
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WA |
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Discussion | Varieties 3 (3 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety cereus grows in Chelan, Douglas, Grant, and Kittitas counties, apparently occurring as an enclave within the range of the typical variety. The vestiture and elongate proximal internodes of var. cereus are distinctive even within the group of species most closely related to Erigeron poliospermus; intergrades with typical E. poliospermus in vestiture and habit appear to be relatively common. Analogous variants occur within E. concinnus and are recognized at varietal rank. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 285. | FNA vol. 20, p. 286. | ||||||||
Parent taxa | Asteraceae > tribe Astereae > Erigeron | Asteraceae > tribe Astereae > Erigeron > Erigeron poliospermus | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | A. Gray: in A. Gray et al., Syn. Fl. N. Amer. 1(2): 210. (1884) | Cronquist: Brittonia 6: 194. (1947) | ||||||||
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