Senecio triangularis |
Senecio pudicus |
|
---|---|---|
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
bashful ragwort |
|
Habit | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). | Perennials or biennials (possibly winter annuals), 50–80 cm (caudices fibrous-rooted). |
Herbage | glabrous or sparsely floccose-tomentose when young. |
glabrous. |
Stems | single or loosely clustered. |
usually single, sometimes loosely 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). |
progressively reduced distally; petiolate; blades narrowly lanceolate to oblanceolate, 8–15(–20+) × (0.5–)1–3(–4) cm, bases tapered, margins entire or dentate (mid and distal leaves sessile, bractlike). |
Ray florets | ± 8; corolla laminae 9–15 mm. |
0. |
Phyllaries | (± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
usually ± 13, rarely ± 8, 5–9 mm, tips green. |
Calyculi | of 2–6 bractlets (rarely more than 2 mm). |
of 2–6 lance-linear bractlets. |
Heads | 10–30(–60) in corymbiform to subracemiform arrays. |
nodding, (3–)8–16(–40+) in racemiform or paniculiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40, 80. |
|
Senecio triangularis |
Senecio pudicus |
|
Phenology | Flowering summer. | Flowering summer–early autumn. |
Habitat | Damp places, open woodlands, especially rocky stream banks in coniferous forests | Rocky, damp or drying hillsides, often coniferous and aspen woodlands |
Elevation | 100–3300 m (300–10800 ft) | 2400–3800 m (7900–12500 ft) |
Distribution |
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
|
CO; NM; UT |
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. 566. | FNA vol. 20, p. 550. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. gibbonsii, S. saliens, S. triangularis var. angustifolius | S. cernuus, Ligularia pudica |
Name authority | Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) | Greene: Pittonia 4: 118. (1900) |
Web links |