Erigeron rydbergii |
Erigeron philadelphicus |
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Philadelphia fleabane |
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Habit | Plants annual, biennial, or short-lived perennial, 10–80 cm; roots fibrous, caudices usually simple. | |
Stems | erect, sparsely to moderately hirsute to lanate, minutely glandular. |
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Basal leaves | 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. |
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Cauline leaves | oblanceolate to lanceolate to elliptic or oblong, 5–130 × 3–25 mm, distally reduced, bases clasping; surfaces eglandular. |
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Involucres | 3–6 × 6–15 mm. |
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Ray florets | 150–250, white to pink; rays 2–7 × 0.2–0.5 mm. |
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Disc florets | corollas 2–3 mm. |
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Phyllaries | in 2–3 series; surfaces sparsely to moderately hirsute, minutely glandular. |
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Fruits | 1–1.5 mm, sparsely to moderately strigose; inner pappi of numerous barbellate bristles. |
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Heads | (1)3–many in corymb-like arrays, radiate. |
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2n | =18. |
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Erigeron rydbergii |
Erigeron philadelphicus |
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Distribution | ||
Discussion | Disturbed areas, streambanks, fields, meadows, forest openings. Flowering Apr–Sep. 0–1900 m. All ecoregions. CA, ID, NV, WA; nearly worldwide. Native. |
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Source | Flora of Oregon, volume 2, page 260 James Riser, Stephen Meyers |
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Sibling taxa | ||
Synonyms | Erigeron philadelphicus var. philadelphicus | |
Web links |