Senecio flaccidus |
Senecio clarkianus |
|||||||||
---|---|---|---|---|---|---|---|---|---|---|
Douglas' groundsel, Mono groundsel, shrubby butterweed, shrubby ragwort, threadleaf groundsel, threadleaf ragwort |
Clark's ragwort |
|||||||||
Habit | Subshrubs or shrubs, (30–)40–120+ cm (taproots forming woody crowns). | Perennials, (50–)60–100(–120) cm (caudices fibrous-rooted). | ||||||||
Herbage | glabrous or ± lanate-tomentose. |
sparsely floccose-tomentose, unevenly glabrescent. |
||||||||
Stems | usually multiple (little branched, arching-erect). |
single. |
||||||||
Leaves | ± evenly distributed; sessile or obscurely petiolate; blades narrowly linear to filiform (or pinnatifid, the segments linear to filiform), 3–10(–12) cm, bases ± linear, ultimate margins entire or remotely toothed (fascicles of smaller leaves sometimes borne in axils of larger leaves). |
evenly distributed; petiolate; well-developed mid leaves: blades lanceolate to oblong,(8–)10–15(–18) × (2–)3–5(–9) cm overall, margins deeply dentate or irregularly pinnate-lobed to laciniate; distal leaves sessile, weakly clasping. |
||||||||
Ray florets | usually ± 8 or ± 13, sometimes ± 21; corolla laminae 10–15(–20) mm (mostly yellow, sometimes ochroleucous). |
± 8 or ± 13; corolla laminae 8–12(–20) mm. |
||||||||
Phyllaries | ± 13 or ± 21+, 5–10(–12) mm, tips green or minutely black. |
± 13 or ± 21, 5–8 mm, tips green. |
||||||||
Calyculi | usually of 3–5+ bractlets (lengths often to 1/2+ phyllaries), sometimes 0. |
of 3–8+ linear to filiform bractlets (lengths 1/2–3/4+ phyllaries). |
||||||||
Heads | (1–)3–10(–20+) in corymbiform or subcorymbiform clusters, often gathered in larger, showy arrays (involucres campanulate or cylindric). |
8–20 in corymbiform arrays. |
||||||||
Cypselae | hairy. |
glabrous. |
||||||||
2n | = 40. |
|||||||||
Senecio flaccidus |
Senecio clarkianus |
|||||||||
Phenology | Flowering late summer. | |||||||||
Habitat | Moist meadows, conifer-dominated sites | |||||||||
Elevation | 1400–2700 m (4600–8900 ft) | |||||||||
Distribution |
AZ; CA; CO; KS; NM; NV; OK; TX; UT; Mexico
|
CA
|
||||||||
Discussion | Varieties 3 (3 in the flora). The varieties of Senecio flaccidus are distinguished by morphologic tendencies and geography. The species occurs southward to central Mexico; a sound understanding of the infraspecific taxonomy must await revisionary studies that include the Mexican plants. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Senecio clarkianus grows on west slopes of the central and southern Sierra Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
||||||||
Key |
|
|||||||||
Source | FNA vol. 20, p. 558. | FNA vol. 20, p. 566. | ||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | Lessing: Linnaea 5: 161. (1830) | A. Gray: Proc. Amer. Acad. Arts 7: 362. (1868) | ||||||||
Web links |