Senecio aphanactis |
Senecio flaccidus |
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California groundsel, chaparral ragwort, rayless ragwort |
Douglas' groundsel, Mono groundsel, shrubby butterweed, shrubby ragwort, threadleaf groundsel, threadleaf ragwort |
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Habit | Annuals, 5–20+ cm (taproots relatively short and thin). | Subshrubs or shrubs, (30–)40–120+ cm (taproots forming woody crowns). | ||||||||
Herbage | glabrous or sparsely tomentose (especially distally). |
glabrous or ± lanate-tomentose. |
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Stems | usually 1 (relatively thin, delicate). |
usually multiple (little branched, arching-erect). |
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Leaves | evenly distributed; sessile; blades oblanceolate to lance-linear, 2–4 × 0.5–1 cm, bases sometimes weakly clasping, margins usually subpinnate to dentate, sometimes subentire (distal leaves bractlike). |
± 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). |
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Ray florets | 0 or 1–5; corolla laminae 0.5–1+ mm (barely surpassing phyllaries, heads perhaps technically disciform). |
usually ± 8 or ± 13, sometimes ± 21; corolla laminae 10–15(–20) mm (mostly yellow, sometimes ochroleucous). |
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Phyllaries | ± 8 or ± 13, 5–6 mm, tips greenish. |
± 13 or ± 21+, 5–10(–12) mm, tips green or minutely black. |
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Calyculi | 0 or of 1–3+ lance-deltate bractlets. |
usually of 3–5+ bractlets (lengths often to 1/2+ phyllaries), sometimes 0. |
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Heads | 4–10+ in open, cymiform arrays. |
(1–)3–10(–20+) in corymbiform or subcorymbiform clusters, often gathered in larger, showy arrays (involucres campanulate or cylindric). |
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Cypselae | densely hairy. |
hairy. |
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2n | = 40. |
= 40. |
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Senecio aphanactis |
Senecio flaccidus |
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Phenology | Flowering late winter–spring. | |||||||||
Habitat | Dry, open ground, especially alkaline flats | |||||||||
Elevation | 10–400 m (0–1300 ft) | |||||||||
Distribution |
CA; Mexico (Baja California)
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AZ; CA; CO; KS; NM; NV; OK; TX; UT; Mexico
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Discussion | Of conservation concern. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
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Key |
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Source | FNA vol. 20, p. 563. | FNA vol. 20, p. 558. | ||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | Greene: Pittonia 1: 220. (1888) | Lessing: Linnaea 5: 161. (1830) | ||||||||
Web links |