Senecio crassulus |
Senecio triangularis |
|
---|---|---|
mountain meadow butterweed, thick-leaf groundsel, thick-leaf ragwort |
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
|
Habit | Perennials, (15–)20–50(–70) cm (rhizomes branched, ± woody). | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). |
Herbage | glabrous. |
glabrous or sparsely floccose-tomentose when young. |
Stems | 1–(2–4). |
single or loosely clustered. |
Leaves | (thickish-turgid) progressively reduced distally; petiolate; blades broadly lanceolate to subelliptic, 2.5–15 × 1–5 cm, bases tapered, margins sharply dentate to subentire (some teeth callous; mid leaves sometimes larger than proximal; distal leaves sessile, smaller, often clasping). |
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). |
Ray florets | ± 8 or ± 13; corolla laminae 5–12 mm. |
± 8; corolla laminae 9–15 mm. |
Phyllaries | (± 8) ± 13 or ± 21, 5–9 mm, tips black (villous). |
(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
Calyculi | of (1–)3–6 linear to filiform bractlets (lengths to 1/3 phyllaries). |
of 2–6 bractlets (rarely more than 2 mm). |
Heads | (1–)4–12 in corymbiform arrays. |
10–30(–60) in corymbiform to subracemiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
= 40, 80. |
Senecio crassulus |
Senecio triangularis |
|
Phenology | Flowering summer. | Flowering summer. |
Habitat | Moist to drying hillsides, meadows, other open places in forest associations | Damp places, open woodlands, especially rocky stream banks in coniferous forests |
Elevation | 2200–3700 m (7200–12100 ft) | 100–3300 m (300–10800 ft) |
Distribution |
CO; ID; MT; NM; NV; OR; SD; UT; WY
|
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
|
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.) |
|
Source | FNA vol. 20, p. 551. | FNA vol. 20, p. 566. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. lapathifolius, S. semiamplexicaulis | S. gibbonsii, S. saliens, S. triangularis var. angustifolius |
Name authority | A. Gray: Proc. Amer. Acad. Arts 19: 54. (1883) | Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) |
Web links |