Erigeron chrysopsidis |
Erigeron disparipilus(synonym of Erigeron engelmannii) |
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dwarf yellow fleabane |
Snake River daisy, white cushion fleabane |
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Habit | Plants perennial, 3–20 cm; taprooted, usually with many woody, branching caudices. | Plants perennial, 8–22 cm; taprooted, with branching caudices. |
Stems | erect; hirsute, eglandular to minutely glandular. |
erect, sparsely to moderately hirsute to strigose, eglandular. |
Basal leaves | persistent in dense clusters, linear to narrowly oblanceolate, 10–80 × 1–3 mm; margins entire with hispid hairs; surfaces hirsute to hispid, sometimes nearing strigose. |
persistent, narrowly spatulate to narrowly oblanceolate-elliptic, 30–80 × 3–5 mm; margins entire, with 1 prominent vein; surfaces moderately to densely strigose, eglandular. |
Cauline leaves | abruptly reduced to (0)1–3 linear bracts. |
few, linear, 10–40 × 1–3 mm, reduced distally. |
Involucres | 4–7 × 10–16 mm. |
3.5–8 × 12–18 mm. |
Ray florets | 20–60; corollas with well-developed yellow rays, 4–8 × 0.5–2 mm, or tubular and short, or rays lacking. |
25–50, white or cream, occasionally fading to pink; rays 4–8 × 1–3 mm. |
Disc florets | corollas 4–5 mm. |
corollas 3–4 mm. |
Phyllaries | in 2–3 series, sparsely to moderately hispid-villous, often minutely glandular. |
in 2–3 series, usually with dark green medial area with or without orange stripe; surfaces moderately to densely hirsute or strigose, moderately to densely glandular. |
Fruits | 2–3 mm, moderately strigose; inner pappi of numerous barbellate bristles. |
1.5–3 mm, sparsely to moderately strigose; inner pappi of numerous barbellate bristles. |
Heads | 1, radiate or disciform. |
usually 1, radiate. |
Erigeron chrysopsidis |
Erigeron disparipilus |
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Distribution | ||
Discussion | Western United States. 3 varieties. |
Open rocky areas, ridges. Flowering Jun–Jul. 1100–1800 m. BW. ID, WA. Native. Some floras recognize plants with stem hairs in the same orientation (versus mixed) as E. davisii. The ranges and habitat of these taxa are, however, sympatric. Until further evidence shows otherwise, there is no compelling reason to recognize E. davisii as distinct from E. disparipilus. |
Source | Flora of Oregon, volume 2, page 254 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 255 James Riser, Stephen Meyers |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Erigeron davisii, Erigeron engelmannii, Erigeron engelmannii ssp. davisii, Erigeron engelmannii var. davisii | |
Web links |