Erigeron speciosus(synonym of Erigeron subtrinervis) |
Erigeron disparipilus |
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showy daisy, showy fleabane |
Snake River daisy, white cushion fleabane |
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Habit | Plants perennial, 15–75 cm; rhizomatous, fibrous-rooted, caudices branching. | Plants perennial, 8–22 cm; taprooted, with branching caudices. |
Stems | erect; surfaces glabrous to rarely remotely hirsute, sometimes minutely glandular distally. |
erect, sparsely to moderately hirsute to strigose, eglandular. |
Basal leaves | usually withering by flowering, oblanceolate to spatulate. |
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 | lanceolate, 20–80 × 5–15 mm, gradually reduced distally, bases ± clasping; margins entire, usually long-ciliate; surfaces glabrous, rarely remotely strigose. |
few, linear, 10–40 × 1–3 mm, reduced distally. |
Involucres | 3–7 × 11–16 mm. |
3.5–8 × 12–18 mm. |
Ray florets | 40–115+, lavender to purple; rays 7–11 × 0.7–1.5 mm. |
25–50, white or cream, occasionally fading to pink; rays 4–8 × 1–3 mm. |
Disc florets | 2–3 mm. |
corollas 3–4 mm. |
Phyllaries | in 2–3+ series, usually with orange stripe; surfaces basally hirsute to villous, occasionally 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, glabrous to sparsely strigose; inner pappi of numerous barbellate bristles. |
1.5–3 mm, sparsely to moderately strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–5+ in corymb-like arrays, radiate. |
usually 1, radiate. |
Erigeron speciosus |
Erigeron disparipilus |
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Distribution | ||
Discussion | 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. |
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 draft James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 255 James Riser, Stephen Meyers |
Sibling taxa | ||
Synonyms | Erigeron speciosus var. macranthus, Erigeron speciosus var. speciosus, Erigeron subtrinervis | Erigeron davisii, Erigeron engelmannii, Erigeron engelmannii ssp. davisii, Erigeron engelmannii var. davisii |
Web links |