Senecio astephanus |
Senecio serra |
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San Gabriel ragwort |
butterweed groundsel, sawtooth groundsel, serrated ragwort, tall butterweed, tall ragwort |
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Habit | Perennials, 40–100 cm (caudices unknown). | Perennials, 40–100(–250) cm (caudices ligneous, branched). | ||||
Herbage | unevenly floccose-lanate or tomentose, glabrescent. |
glabrous or lightly floccose-tomentose proximally when young. |
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Stems | single. |
single or loosely clustered. |
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Leaves | progressively reduced distally; petiolate; blades elliptic-ovate to lanceolate, 10–20(–30?) × 3–7+ cm, bases tapered, margins dentate to denticulate (teeth cartilaginous; mid leaves similar, sessile, smaller; distal leaves bractlike). |
evenly distributed (proximal often withering before flowering); petiolate or subsessile; blades lanceolate or narrowly lanceolate to sublinear, 5–15(–20+) × (1–)1.5–4 cm, bases tapered, margins dentate to subentire (distal leaves smaller, bractlike). |
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Ray florets | 0. |
± 5 or ± 8; corolla laminae 5–10 mm. |
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Phyllaries | ± 21, 7–8 mm, tips greenish. |
± 8 or ca. 13, 4–9 mm, tips usually green, sometimes black. |
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Calyculi | of 5–8+ lance-linear to filiform bractlets (lengths 1/3–7/8 phyllaries). |
of 2–6 linear to filiform bractlets (0.5–5 mm). |
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Heads | 10–20+ in loose or congested, cymiform arrays. |
30–90+ in corymbiform to subpaniculiform arrays. |
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Cypselae | glabrous. |
glabrous or glabrate. |
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2n | = 40. |
= 40. |
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Senecio astephanus |
Senecio serra |
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Phenology | Flowering spring. | |||||
Habitat | Steep, rocky slopes | |||||
Elevation | 400–1500 m (1300–4900 ft) | |||||
Distribution |
CA |
CA; CO; ID; MT; NV; OR; UT; WA; WY
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Discussion | Of conservation concern. Senecio astephanus is collected infrequently. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). Varieties of Senecio serra are distinguished by head size and distribution. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 553. | FNA vol. 20, p. 566. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Greene: Pittonia 1: 174. (1888) | Hooker: Fl. Bor.-Amer. 1: 333. (1834) | ||||
Web links |