Senecio integerrimus |
Senecio crassulus |
|
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lambstongue ragwort, western groundsel |
mountain meadow butterweed, thick-leaved groundsel |
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Habit | Herbs perennial or biennial, (1)2–7 dm; caudices button-like, with fleshy, fibrous, unbranched roots. | Herbs perennial, (1.5)2–5(7) dm; caudices ± woody, branching, rhizomatous. |
Stems | 1, loosely arachnoid-tomentose, or villous, glabrate with age. |
1–4, glabrous. |
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. |
basal present at flowering; cauline evenly distributed along stems; thick and fleshy, lanceolate to subelliptic, bases tapering; margins dentate with callous denticles to subentire; surfaces glabrous, sometimes with broadly winged petioles; proximal often early deciduous; mid-cauline sometimes larger, sessile and weakly clasping; distal smaller, sessile and clasping. |
Inflorescences | corymb-like arrays; bracts 0 or inconspicuous. |
corymb-like arrays; bracts 2–4 mm, conspicuous. |
Involucres | urn-shaped. |
broadly campanulate. |
Ray florets | 5, rarely 0; rays 6–15(20) mm, yellow or white to pale yellow. |
8 or 13; rays 5–12 mm. |
Disc florets | 35–45. |
55–65; deep golden to orange-yellow. |
Phyllaries | (8)13 or 21; tips usually black, sometimes green. |
(8)13 or 21, 5–9 mm, with black tips; surfaces densely tomentose. |
Calyculi | 1–5+, inconspicuous, usually < 2 mm. |
(1)3–6 linear to filiform bractlets; (1)2–6 mm, with or without black tips. |
Fruits | 2.5–3 mm, usually glabrous, sometimes hairy along ribs. |
2–2.5 mm, glabrous. |
Heads | 6–15(30+). |
(1)4–12. |
2n | =40, 80. |
=40. |
Senecio integerrimus |
Senecio crassulus |
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Distribution | ||
Discussion | Western North America. 5 varieties; 3 varieties treated in Flora. |
Wet to drying hillsides and meadows, open forests. Flowering May–Aug. 800–3000 m. BR, BW, Owy. ID, NV; northeast to MT, east to SD, southeast to NM. Native. |
Source | Flora of Oregon, volume 2, page 339 Debra Trock |
Flora of Oregon, volume 2, page 338 Debra Trock |
Sibling taxa | ||
Subordinate taxa | ||
Web links |
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