Senecio integerrimus |
Senecio sphaerocephalus |
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lambstongue ragwort, western groundsel |
ballhead ragwort, mountain marsh butterweed |
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Habit | Herbs perennial or biennial, (1)2–7 dm; caudices button-like, with fleshy, fibrous, unbranched roots. | Herbs perennial, (3)4–8 dm; caudices ± woody, branching, with stout rhizomes. |
Stems | 1, loosely arachnoid-tomentose, or villous, glabrate with age. |
1, tomentose or unevenly glabrate. |
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. |
mostly basal; basal present at flowering; cauline reduced distally; distal much reduced and bract-like, oblanceolate to elliptic, bases tapered; margins weakly dentate or denticulate with callous denticles; surfaces sparsely tomentose to nearly glabrous, petiolate. |
Inflorescences | corymb-like arrays; bracts 0 or inconspicuous. |
corymb-like arrays; bracts conspicuous. |
Involucres | urn-shaped. |
campanulate. |
Ray florets | 5, rarely 0; rays 6–15(20) mm, yellow or white to pale yellow. |
~13; rays 6–10 mm. |
Disc florets | 35–45. |
25–35+. |
Phyllaries | (8)13 or 21; tips usually black, sometimes green. |
(13)21, 3–7 mm; tips black or dark brown. |
Calyculi | 1–5+, inconspicuous, usually < 2 mm. |
1–5 bractlets, 2–3 mm. |
Fruits | 2.5–3 mm, usually glabrous, sometimes hairy along ribs. |
1.5–2.5 mm, usually hairy, sometimes glabrous. |
Heads | 6–15(30+). |
(3)5–24, usually > 10. |
2n | =40, 80. |
=40. |
Senecio integerrimus |
Senecio sphaerocephalus |
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Distribution | ||
Discussion | Western North America. 5 varieties; 3 varieties treated in Flora. |
Open meadows, near conifer forests. Flowering Jun–Jul. 1100–1700 m. BW. ID, NV; northeast to MT, east to WY, southeast to CO. Native. Although Senecio sphaerocephalus has been collected in Oregon, it is relatively rare within the state and more abundant in the more easterly parts of its range. |
Source | Flora of Oregon, volume 2, page 339 Debra Trock |
Flora of Oregon, volume 2, page 340 Debra Trock |
Sibling taxa | ||
Subordinate taxa | ||
Web links |
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