Senecio flaccidus |
Senecio taraxacoides |
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Douglas' groundsel, Mono groundsel, shrubby butterweed, shrubby ragwort, threadleaf groundsel, threadleaf ragwort |
dandelion ragwort |
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Habit | Subshrubs or shrubs, (30–)40–120+ cm (taproots forming woody crowns). | Perennials, 5–10(–14) cm (caudices branched, fibrous-rooted). | ||||||||
Herbage | glabrous or ± lanate-tomentose. |
(sometimes purple-tinged) floccose-tomentose (persistently on abaxial faces of leaves, glabrescent elsewhere). |
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Stems | usually multiple (little branched, arching-erect). |
single or loosely clustered. |
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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; blades oblanceolate to ovate, (1–)2–6 × 1–2.5 cm, bases tapered, margins dentate or incised to subpinnatifid (distal leaves bractlike). |
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Ray florets | usually ± 8 or ± 13, sometimes ± 21; corolla laminae 10–15(–20) mm (mostly yellow, sometimes ochroleucous). |
usually ± 13, sometimes fewer or 0; corolla laminae 8–12 mm. |
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Phyllaries | ± 13 or ± 21+, 5–10(–12) mm, tips green or minutely black. |
± 13 or ± 21, 7–10 mm, tips green. |
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Calyculi | usually of 3–5+ bractlets (lengths often to 1/2+ phyllaries), sometimes 0. |
of 2–5 lance-linear bractlets (lengths 1/3–2/3 phyllaries). |
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Heads | (1–)3–10(–20+) in corymbiform or subcorymbiform clusters, often gathered in larger, showy arrays (involucres campanulate or cylindric). |
1(–5). |
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Cypselae | hairy. |
glabrous. |
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2n | = 40. |
= 40. |
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Senecio flaccidus |
Senecio taraxacoides |
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Phenology | Late summer. | |||||||||
Habitat | Alpine peaks | |||||||||
Elevation | 3500–4000 m (11500–13100 ft) | |||||||||
Distribution |
AZ; CA; CO; KS; NM; NV; OK; TX; UT; Mexico
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CO; NM |
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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.) |
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Key |
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Source | FNA vol. 20, p. 558. | FNA vol. 20, p. 551. | ||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | S. amplectens var. taraxacoides, Ligularia taraxacoides | |||||||||
Name authority | Lessing: Linnaea 5: 161. (1830) | (A. Gray) Greene: Pittonia 4: 119. (1900) | ||||||||
Web links |