Erigeron elegantulus |
Erigeron philadelphicus |
|
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dwarf blue fleabane, volcanic fleabane |
Philadelphia fleabane |
|
Habit | Plants perennial, 4–10 cm; taprooted, with branching caudices. | Plants annual, biennial, or short-lived perennial, 10–80 cm; roots fibrous, caudices usually simple. |
Stems | erect to basally ascending, sparsely to moderately strigose, eglandular. |
erect, sparsely to moderately hirsute to lanate, minutely glandular. |
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. |
withering by flowering, oblanceolate to nearly spatulate, 20–170 × 5–35 mm; margins nearly entire, coarsely serrate, lobulate, or shallowly dentate; surfaces slightly to moderately strigose or hirsute, eglandular. |
Cauline leaves | abruptly reduced and usually restricted to basal ? of stem, bases sheathing. |
oblanceolate to lanceolate to elliptic or oblong, 5–130 × 3–25 mm, distally reduced, bases clasping; surfaces eglandular. |
Involucres | 3–5 × 8–11 mm. |
3–6 × 6–15 mm. |
Ray florets | 15–30, lavender to purple; rays 3–8 × 0.7–1.3 mm. |
150–250, white to pink; rays 2–7 × 0.2–0.5 mm. |
Disc florets | corollas 2.5–3.5 mm. |
corollas 2–3 mm. |
Phyllaries | in 3–4 unequal series; surfaces sparsely strigose, eglandular. |
in 2–3 series; surfaces sparsely to moderately hirsute, minutely glandular. |
Fruits | 1–2 mm, nearly glabrous to sparsely strigose; inner pappi of numerous barbellate bristles. |
1–1.5 mm, sparsely to moderately strigose; inner pappi of numerous barbellate bristles. |
Heads | 1, radiate. |
(1)3–many in corymb-like arrays, radiate. |
2n | =27. |
=18. |
Erigeron elegantulus |
Erigeron philadelphicus |
|
Distribution | ||
Discussion | Rocky areas, sagebrush, coniferous forests. Flowering Jun–Aug. 700–2500 m. BR, BW, Casc, Owy. CA. Native. |
Disturbed areas, streambanks, fields, meadows, forest openings. Flowering Apr–Sep. 0–1900 m. All ecoregions. CA, ID, NV, WA; nearly worldwide. Native. |
Source | Flora of Oregon, volume 2, page 256 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 260 James Riser, Stephen Meyers |
Sibling taxa | ||
Synonyms | Erigeron philadelphicus var. philadelphicus | |
Web links |