Senecio flaccidus |
Senecio blochmaniae |
|||||||||
---|---|---|---|---|---|---|---|---|---|---|
Douglas' groundsel, Mono groundsel, shrubby butterweed, shrubby ragwort, threadleaf groundsel, threadleaf ragwort |
Blochman's ragwort, dune ragwort |
|||||||||
Habit | Subshrubs or shrubs, (30–)40–120+ cm (taproots forming woody crowns). | Subshrubs, 45–130 cm (taproots forming woody crowns). | ||||||||
Herbage | glabrous or ± lanate-tomentose. |
glabrous or sparsely hairy. |
||||||||
Stems | usually multiple (little branched, arching-erect). |
usually multiple (arching upwards). |
||||||||
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 (often crowded; proximal often withering and pendulous); sessile or ± petiolate; blades linear-filiform, 3–12 cm × 1–3 mm, bases ± linear, margins entire. |
||||||||
Ray florets | usually ± 8 or ± 13, sometimes ± 21; corolla laminae 10–15(–20) mm (mostly yellow, sometimes ochroleucous). |
± 8; corolla laminae 8–10 mm. |
||||||||
Phyllaries | ± 13 or ± 21+, 5–10(–12) mm, tips green or minutely black. |
± 13, 7–10 mm, tips green. |
||||||||
Calyculi | usually of 3–5+ bractlets (lengths often to 1/2+ phyllaries), sometimes 0. |
0 or of 1–3+ lance-deltate to linear bractlets (lengths to 1/4 phyllaries). |
||||||||
Heads | (1–)3–10(–20+) in corymbiform or subcorymbiform clusters, often gathered in larger, showy arrays (involucres campanulate or cylindric). |
5–20 in corymbiform arrays (involucres campanulate). |
||||||||
Cypselae | hairy. |
hirtellous (canescent). |
||||||||
2n | = 40. |
= 40. |
||||||||
Senecio flaccidus |
Senecio blochmaniae |
|||||||||
Phenology | Flowering summer–early fall. | |||||||||
Habitat | Coastal sand dunes and sandy, open flood plains | |||||||||
Elevation | 0–100 m (0–300 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.) |
Of conservation concern. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
||||||||
Key |
|
|||||||||
Source | FNA vol. 20, p. 558. | FNA vol. 20, p. 560. | ||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | Lessing: Linnaea 5: 161. (1830) | Greene: Erythaea 1: 7. (1893) | ||||||||
Web links |