Senecio integerrimus |
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lambstongue ragwort, 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. |
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. |
Inflorescences | corymb-like arrays; bracts 0 or inconspicuous. |
Involucres | urn-shaped. |
Ray florets | 5, rarely 0; rays 6–15(20) mm, yellow or white to pale yellow. |
Disc florets | 35–45. |
Phyllaries | (8)13 or 21; tips usually black, sometimes green. |
Calyculi | 1–5+, inconspicuous, usually < 2 mm. |
Fruits | 2.5–3 mm, usually glabrous, sometimes hairy along ribs. |
Heads | 6–15(30+). |
2n | =40, 80. |
Senecio integerrimus |
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Distribution | |
Discussion | Western North America. 5 varieties; 3 varieties treated in Flora. |
Source | Flora of Oregon, volume 2, page 339 Debra Trock |
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Web links |
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