Erigeron oreganus |
Erigeron elegantulus |
|
---|---|---|
Gorge daisy, gorge fleabane, Oregon fleabane |
dwarf blue fleabane, volcanic fleabane |
|
Habit | Plants perennial, 5–15 cm; taprooted, caudices unbranched. | Plants perennial, 4–10 cm; taprooted, with branching caudices. |
Stems | decumbent to erect; hirsute with unequal hairs, sparsely glandular. |
erect to basally ascending, sparsely to moderately strigose, eglandular. |
Basal leaves | persistent, obovate, 15–90 × 5–20 mm; margins coarsely serrate to shallowly lobulate; surfaces sparsely to moderately hirsute to strigose. |
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. |
Cauline leaves | obovate to elliptic; little or not reduced distally; surfaces sparsely to moderately hirsute. |
abruptly reduced and usually restricted to basal ? of stem, bases sheathing. |
Involucres | 4–7 × 9–15 mm. |
3–5 × 8–11 mm. |
Ray florets | 30–60, pink to purple; rays 4–5 × 0.5–1 mm. |
15–30, lavender to purple; rays 3–8 × 0.7–1.3 mm. |
Disc florets | corollas 3–5 mm. |
corollas 2.5–3.5 mm. |
Phyllaries | in 2–3 series, pale green with dark green medial stripe; surfaces remotely hirsute, strongly stipitate-glandular. |
in 3–4 unequal series; surfaces sparsely strigose, eglandular. |
Fruits | 2–3 mm, moderately strigose; inner pappi of several unbarbed to weakly barbellate twisted bristles. |
1–2 mm, nearly glabrous to sparsely strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–4, radiate. |
1, radiate. |
2n | =27. |
|
Erigeron oreganus |
Erigeron elegantulus |
|
Distribution | ||
Discussion | Shady cliffs, rocky slopes, crevices. Flowering May–Aug. 100–400 m. Casc. WA. Native. This uncommon species is found only in the Columbia River Gorge. |
Rocky areas, sagebrush, coniferous forests. Flowering Jun–Aug. 700–2500 m. BR, BW, Casc, Owy. CA. Native. |
Source | Flora of Oregon, volume 2, page 259 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 256 James Riser, Stephen Meyers |
Sibling taxa | ||
Web links |