Erigeron disparipilus(synonym of Erigeron engelmannii) |
Erigeron speciosus |
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Snake River daisy, white cushion fleabane |
showy daisy, showy fleabane |
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Habit | Plants perennial, 8–22 cm; taprooted, with branching caudices. | Plants perennial, 15–75 cm; rhizomatous, fibrous-rooted, caudices branching. |
Stems | erect, sparsely to moderately hirsute to strigose, eglandular. |
erect; surfaces glabrous to rarely remotely hirsute, sometimes minutely glandular distally. |
Basal leaves | persistent, narrowly spatulate to narrowly oblanceolate-elliptic, 30–80 × 3–5 mm; margins entire, with 1 prominent vein; surfaces moderately to densely strigose, eglandular. |
usually withering by flowering, oblanceolate to spatulate. |
Cauline leaves | few, linear, 10–40 × 1–3 mm, reduced distally. |
lanceolate, 20–80 × 5–15 mm, gradually reduced distally, bases ± clasping; margins entire, usually long-ciliate; surfaces glabrous, rarely remotely strigose. |
Involucres | 3.5–8 × 12–18 mm. |
3–7 × 11–16 mm. |
Ray florets | 25–50, white or cream, occasionally fading to pink; rays 4–8 × 1–3 mm. |
40–115+, lavender to purple; rays 7–11 × 0.7–1.5 mm. |
Disc florets | corollas 3–4 mm. |
2–3 mm. |
Phyllaries | 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. |
in 2–3+ series, usually with orange stripe; surfaces basally hirsute to villous, occasionally minutely glandular. |
Fruits | 1.5–3 mm, sparsely to moderately strigose; inner pappi of numerous barbellate bristles. |
2–3 mm, glabrous to sparsely strigose; inner pappi of numerous barbellate bristles. |
Heads | usually 1, radiate. |
1–5+ in corymb-like arrays, radiate. |
Erigeron disparipilus |
Erigeron speciosus |
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Distribution | ||
Discussion | 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. |
Conifer forests, moist slopes, riverbanks, wet meadows. Flowering Jun–Sep. 50–2500 m. BR, BW, CR, WV. ID, NV, WA; north to British Columbia, northeast to Alberta, east to NE, southeast to NM. Native. |
Source | Flora of Oregon, volume 2, page 255 James Riser, Stephen Meyers |
Flora of Oregon, volume 2 draft James Riser, Stephen Meyers |
Sibling taxa | ||
Synonyms | Erigeron davisii, Erigeron engelmannii, Erigeron engelmannii ssp. davisii, Erigeron engelmannii var. davisii | Erigeron speciosus var. macranthus, Erigeron speciosus var. speciosus, Erigeron subtrinervis |
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