Senecio integerrimus |
Senecio elmeri |
|||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
Elmer's butterweed, Elmer's ragwort |
|||||||||||||||||
Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Perennials, 10–20(–30) cm (rhizomes trailing or branching). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
unevenly villous-tomentose or floccose, glabrescent. |
||||||||||||||||
Stems | single. |
single (from loosely clustered basal leaves). |
||||||||||||||||
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). |
progressively reduced distally; ± petiolate; blades ovate to oblanceolate, (3–)4–8(–10) × 2–3(–4) cm, bases tapered, margins shallowly dentate (mid and distal leaves smaller, bractlike, often clasping). |
||||||||||||||||
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 8–15 mm. |
||||||||||||||||
Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
(± 8) ± 13, 8–10 mm, tips black (villous). |
||||||||||||||||
Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
of 2–7 lance-linear to linear bractlets (lengths 1/3–2/3 phyllaries). |
||||||||||||||||
Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
erect or weakly nodding (especially in bud), (2–)5–9(–12) in loose, cymiform arrays. |
||||||||||||||||
Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
glabrous. |
||||||||||||||||
2n | = 40, 80. |
= 40. |
||||||||||||||||
Senecio integerrimus |
Senecio elmeri |
|||||||||||||||||
Phenology | Flowering summer. | |||||||||||||||||
Habitat | Alpine and subalpine rocky sites and talus slopes | |||||||||||||||||
Elevation | 2000–3000 m (6600–9800 ft) | |||||||||||||||||
Distribution |
CA; CO; IA; ID; KS; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; SK
|
WA; BC
|
||||||||||||||||
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.) |
|||||||||||||||||
Key |
|
|||||||||||||||||
Source | FNA vol. 20, p. 556. | FNA vol. 20, p. 551. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | S. crepidineus | |||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Piper: Erythea 7: 173. (1899) | ||||||||||||||||
Web links |
|