Senecio flaccidus |
|||||||||
---|---|---|---|---|---|---|---|---|---|
Douglas' groundsel, Mono groundsel, shrubby butterweed, shrubby ragwort, threadleaf groundsel, threadleaf ragwort |
|||||||||
Habit | Subshrubs or shrubs, (30–)40–120+ cm (taproots forming woody crowns). | ||||||||
Herbage | glabrous or ± lanate-tomentose. |
||||||||
Stems | usually multiple (little branched, arching-erect). |
||||||||
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). |
||||||||
Ray florets | usually ± 8 or ± 13, sometimes ± 21; corolla laminae 10–15(–20) mm (mostly yellow, sometimes ochroleucous). |
||||||||
Phyllaries | ± 13 or ± 21+, 5–10(–12) mm, tips green or minutely black. |
||||||||
Calyculi | usually of 3–5+ bractlets (lengths often to 1/2+ phyllaries), sometimes 0. |
||||||||
Heads | (1–)3–10(–20+) in corymbiform or subcorymbiform clusters, often gathered in larger, showy arrays (involucres campanulate or cylindric). |
||||||||
Cypselae | hairy. |
||||||||
2n | = 40. |
||||||||
Senecio flaccidus |
|||||||||
Distribution |
AZ; CA; CO; KS; NM; NV; OK; TX; UT; Mexico
|
||||||||
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.) |
||||||||
Key |
|
||||||||
Source | FNA vol. 20, p. 558. | ||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | ||||||||
Sibling taxa | |||||||||
Subordinate taxa | |||||||||
Name authority | Lessing: Linnaea 5: 161. (1830) | ||||||||
Web links |