Senecio triangularis |
Senecio sphaerocephalus |
|
---|---|---|
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
ball-head ragwort, marsh groundsel, mountain marsh butterweed |
|
Habit | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). | Perennials, (30–)40–80 cm (rhizomes stout). |
Herbage | glabrous or sparsely floccose-tomentose when young. |
tomentose, unevenly glabrescent. |
Stems | single or loosely clustered. |
single. |
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; petiolate; blades oblanceolate to elliptic, 4–12x 1–4 cm, bases tapered, margins weakly dentate or denticulate (denticles callous; mid leaves similar, smaller; distal leaves bractlike). |
Ray florets | ± 8; corolla laminae 9–15 mm. |
± 13; corolla laminae 6–10 mm. |
Phyllaries | (± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
(± 13) ± 21, 3–7 mm, tips black or brownish. |
Calyculi | of 2–6 bractlets (rarely more than 2 mm). |
of 1–5 bractlets (longest 2–3 mm). |
Heads | 10–30(–60) in corymbiform to subracemiform arrays. |
(3–)5–24 in corymbiform arrays. |
Cypselae | glabrous. |
usually hairy, sometimes glabrous. |
2n | = 40, 80. |
= 40. |
Senecio triangularis |
Senecio sphaerocephalus |
|
Phenology | Flowering summer. | Flowering spring–early summer. |
Habitat | Damp places, open woodlands, especially rocky stream banks in coniferous forests | Open meadows, especially in coniferous associations |
Elevation | 100–3300 m (300–10800 ft) | 1000–1800 m (3300–5900 ft) |
Distribution |
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
|
ID; MT; NV; OR; UT; WY
|
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. 555. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. gibbonsii, S. saliens, S. triangularis var. angustifolius | S. altus, S. latus, S. lugens var. hookeri |
Name authority | Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) | Greene: Pittonia 3: 106. (1896) |
Web links |