Erigeron neomexicanus |
Erigeron disparipilus(synonym of Erigeron davisii) |
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Snake River daisy, white cushion fleabane |
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Habit | Plants perennial, 8–22 cm; taprooted, with branching caudices. | |
Stems | erect, sparsely to moderately hirsute to strigose, eglandular. |
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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. |
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Cauline leaves | few, linear, 10–40 × 1–3 mm, reduced distally. |
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Involucres | 3.5–8 × 12–18 mm. |
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Ray florets | 25–50, white or cream, occasionally fading to pink; rays 4–8 × 1–3 mm. |
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Disc florets | corollas 3–4 mm. |
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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. |
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Fruits | 1.5–3 mm, sparsely to moderately strigose; inner pappi of numerous barbellate bristles. |
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Heads | usually 1, radiate. |
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Erigeron neomexicanus |
Erigeron disparipilus |
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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. |
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Source | Flora of Oregon, volume 2, page 255 James Riser, Stephen Meyers |
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Sibling taxa | ||
Synonyms | Erigeron davisii, Erigeron engelmannii, Erigeron engelmannii ssp. davisii, Erigeron engelmannii var. davisii | |
Web links |
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