Senecio integerrimus |
Senecio integerrimus var. exaltatus |
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lambstongue ragwort, western groundsel |
Columbia ragwort, lambstongue groundsel, tall western groundsel |
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Habit | Herbs perennial or biennial, (1)2–7 dm; caudices button-like, with fleshy, fibrous, unbranched roots. | |
Stems | 1, loosely arachnoid-tomentose, or villous, glabrate with age. |
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Leaves | mostly basal; cauline progressively reduced distally; ± petiolate; basal and lower cauline elliptic, lanceolate, linear, oblanceolate, rounded-deltate, rarely suborbiculate, bases tapered or truncate to cordate; margins entire or dentate; distal becoming sessile and bract-like. |
elliptic to lanceolate or oblanceolate, rarely rounded-deltate or suborbiculate; basal and proximal indistinctly petiolate. |
Inflorescences | corymb-like arrays; bracts 0 or inconspicuous. |
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Involucres | urn-shaped. |
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Ray florets | 5, rarely 0; rays 6–15(20) mm, yellow or white to pale yellow. |
5, rarely 0; rays 6–15 mm, yellow. |
Disc florets | 35–45. |
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Phyllaries | (8)13 or 21; tips usually black, sometimes green. |
lanceolate; (4)5–10 mm; tips black. |
Calyculi | 1–5+, inconspicuous, usually < 2 mm. |
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Fruits | 2.5–3 mm, usually glabrous, sometimes hairy along ribs. |
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Heads | 6–15(30+). |
6–15(30+). |
2n | =40, 80. |
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Senecio integerrimus |
Senecio integerrimus var. exaltatus |
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Distribution | ||
Discussion | Western North America. 5 varieties; 3 varieties treated in Flora. |
Open woodlands, sagebrush, meadows, grasslands. Flowering Apr–Jul. 50–2700 m. All ecoregions except Est. CA, ID, NV, WA; north to British Columbia, northeast to Saskatchewan, east to WY, southeast to CO. Native. This is the most variable and widespread variety of the species. Eradiate plants have been recognized by some authors as variety vaseyi. However, both radiate and eradiate plants can be found within the same populations. |
Source | Flora of Oregon, volume 2, page 339 Debra Trock |
Flora of Oregon, volume 2, page 340 Debra Trock |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Senecio integerrimus var. vaseyi, Senecio vaseyi | |
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