Senecio integerrimus |
Senecio blochmaniae |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
Blochman's ragwort, dune ragwort |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Subshrubs, 45–130 cm (taproots forming woody crowns). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
glabrous or sparsely hairy. |
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Stems | single. |
usually multiple (arching upwards). |
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Leaves | progressively reduced distally; ± petiolate; blades elliptic, lanceolate, linear, oblanceolate, rounded-deltate, or suborbiculate, 6–25 × 1–6 cm, bases ± tapered or truncate to cordate, margins entire or ± dentate (distal leaves sessile, bractlike). |
evenly distributed (often crowded; proximal often withering and pendulous); sessile or ± petiolate; blades linear-filiform, 3–12 cm × 1–3 mm, bases ± linear, margins entire. |
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Ray florets | usually ± 8 or ± 13, sometimes 0; corolla laminae 6–15(–20) mm (usually yellow, ochroleucous to white in one variety). |
± 8; corolla laminae 8–10 mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
± 13, 7–10 mm, tips green. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
0 or of 1–3+ lance-deltate to linear bractlets (lengths to 1/4 phyllaries). |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
5–20 in corymbiform arrays (involucres campanulate). |
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Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
hirtellous (canescent). |
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2n | = 40, 80. |
= 40. |
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Senecio integerrimus |
Senecio blochmaniae |
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Phenology | Flowering summer–early fall. | |||||||||||||||||
Habitat | Coastal sand dunes and sandy, open flood plains | |||||||||||||||||
Elevation | 0–100 m (0–300 ft) | |||||||||||||||||
Distribution |
CA; CO; IA; ID; KS; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; SK
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CA
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Discussion | Varieties 5 (5 in the flora). The varieties of Senecio integerrimus are distinguished by morphology and geography. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 556. | FNA vol. 20, p. 560. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Greene: Erythaea 1: 7. (1893) | ||||||||||||||||
Web links |
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