Senecio triangularis |
Senecio scorzonella |
|
---|---|---|
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
Sierra groundsel, Sierra ragwort |
|
Habit | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). | Perennials, 10–40(–50) cm (rhizomes stout). |
Herbage | glabrous or sparsely floccose-tomentose when young. |
closely lanate to floccose-tomentose, unevenly glabrescent. |
Stems | single or loosely clustered. |
usually single, rarely clustered. |
Leaves | evenly distributed; petiolate; blades narrowly triangular, (3–)4–10+ × 2–6 cm, bases usually ± truncate, sometimes tapered, margins usually dentate, rarely subentire (distal leaves subsessile, smaller). |
reduced distally; obscurely petiolate; blades oblanceolate to lanceolate, (4–)6–12+ × (1–)1.5–3 cm, bases tapering to winged petioles, margins dentate to denticulate (denticles dark, cartilaginous; mid and distal leaves smaller, bractlike). |
Ray florets | ± 8; corolla laminae 9–15 mm. |
usually ± 5, sometimes 0; corolla laminae 5–8(–10) mm. |
Phyllaries | (± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
± 13, 3–5 mm, tips usually black. |
Calyculi | of 2–6 bractlets (rarely more than 2 mm). |
0 or of 1–3+ lance-deltate to lance-linear bractlets (mostly less than 1 mm). |
Heads | 10–30(–60) in corymbiform to subracemiform arrays. |
(10–)14–24(–30+) in corymbiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40, 80. |
|
Senecio triangularis |
Senecio scorzonella |
|
Phenology | Flowering summer. | Flowering summer. |
Habitat | Damp places, open woodlands, especially rocky stream banks in coniferous forests | Open wooded areas and subalpine meadows |
Elevation | 100–3300 m (300–10800 ft) | 1600–3500 m (5200–11500 ft) |
Distribution |
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
|
CA; NV
|
Discussion | Plants of Senecio triangularis with narrow, subentire leaves that taper to the petioles are occasionally encountered in acid bogs in Oregon and Washington and less frequently elsewhere. They are regarded as edaphic variants; they have been recognized as var. angustifolius. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Senecio scorzonella is restricted to high elevations in the Sierra Nevada–Cascade uplift and the White Mountains of California; it barely enters adjacent Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 566. | FNA vol. 20, p. 554. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. gibbonsii, S. saliens, S. triangularis var. angustifolius | S. covillei, S. covillei var. scorzonella |
Name authority | Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) | Greene: Pittonia 3: 90. (1896) |
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