Senecio integerrimus |
Senecio lemmonii |
|||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
Lemmon's groundsel, Lemmon's ragwort |
|||||||||||||||||
Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Subshrubs (monocarpic?), (10–)20–100 cm (taproots woody). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
glabrous or with tufts of white hairs in leaf axils. |
||||||||||||||||
Stems | single. |
usually 1 (branching distally, unevenly reddish, usually somewhat lax). |
||||||||||||||||
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; petiolate (proximal) or sessile; blades lanceolate to lance-linear, 3–10+ × (0.5–)1–2 cm, bases tapered (or auriculate), margins (sometimes revolute) unevenly dentate to subentire (mid and distal leaves similar, smaller, bases expanded, ± truncate to cordate, clasping). |
||||||||||||||||
Ray florets | usually ± 8 or ± 13, sometimes 0; corolla laminae 6–15(–20) mm (usually yellow, ochroleucous to white in one variety). |
usually ± 8 or ± 13, rarely 0; corolla laminae 8–10 mm. |
||||||||||||||||
Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
± 21, (4–)5–8 mm, tips often with minute black dots. |
||||||||||||||||
Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
of 3–5+ linear to subulate bractlets (to 1.5 mm). |
||||||||||||||||
Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
4–12 in loose, corymbiform arrays. |
||||||||||||||||
Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
hairy. |
||||||||||||||||
2n | = 40, 80. |
|||||||||||||||||
Senecio integerrimus |
Senecio lemmonii |
|||||||||||||||||
Phenology | Flowering late winter–early summer. | |||||||||||||||||
Habitat | Rocky sites in deserts | |||||||||||||||||
Elevation | 500–1000 m (1600–3300 ft) | |||||||||||||||||
Distribution |
CA; CO; IA; ID; KS; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; SK
|
AZ; Mexico
|
||||||||||||||||
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.) |
Some young or depauperate specimens of Senecio lemmonii from northern Mexico resemble S. californicus, which occurs farther to the west in California and Baja California. Whether or not there is a relationship between the two is undetermined. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
||||||||||||||||
Key |
|
|||||||||||||||||
Source | FNA vol. 20, p. 556. | FNA vol. 20, p. 568. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | S. decorticans | |||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | A. Gray: Proc. Amer. Acad. Arts 17: 220. (1882) | ||||||||||||||||
Web links |
|