Erigeron elegantulus |
Erigeron disparipilus(synonym of Erigeron engelmannii) |
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dwarf blue fleabane, volcanic fleabane |
Snake River daisy, white cushion fleabane |
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Habit | Plants perennial, 4–10 cm; taprooted, with branching caudices. | Plants perennial, 8–22 cm; taprooted, with branching caudices. |
Stems | erect to basally ascending, sparsely to moderately strigose, eglandular. |
erect, sparsely to moderately hirsute to strigose, eglandular. |
Basal leaves | persistent, linear to filiform, 20–50 × 0.5–1 mm, white, bases sheathing; margins entire; tips round to acute or acuminate; surfaces sparsely to moderately 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 and usually restricted to basal ? of stem, bases sheathing. |
few, linear, 10–40 × 1–3 mm, reduced distally. |
Involucres | 3–5 × 8–11 mm. |
3.5–8 × 12–18 mm. |
Ray florets | 15–30, lavender to purple; rays 3–8 × 0.7–1.3 mm. |
25–50, white or cream, occasionally fading to pink; rays 4–8 × 1–3 mm. |
Disc florets | corollas 2.5–3.5 mm. |
corollas 3–4 mm. |
Phyllaries | in 3–4 unequal series; surfaces sparsely strigose, eglandular. |
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 | 1–2 mm, nearly 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, radiate. |
usually 1, radiate. |
2n | =27. |
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Erigeron elegantulus |
Erigeron disparipilus |
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Distribution | ||
Discussion | Rocky areas, sagebrush, coniferous forests. Flowering Jun–Aug. 700–2500 m. BR, BW, Casc, Owy. CA. 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, page 256 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 255 James Riser, Stephen Meyers |
Sibling taxa | ||
Synonyms | Erigeron davisii, Erigeron engelmannii, Erigeron engelmannii ssp. davisii, Erigeron engelmannii var. davisii | |
Web links |