Senecio neowebsteri |
Senecio triangularis |
|
---|---|---|
Olympic Mountain ragwort |
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
|
Habit | Perennials, 7–15(–20+) cm (rhizomes fibrous-rooted). | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). |
Herbage | (sometimes purplish-tinged) floccose-tomentose, unevenly glabrescent. |
glabrous or sparsely floccose-tomentose when young. |
Stems | single or loosely clustered (erect or arching). |
single or loosely clustered. |
Leaves | mostly cauline; petiolate (petioles about equaling blades); blades lanceolate or oblanceolate to ovate, (2–)4–8+ × 1.5–3 cm, bases tapered, margins denticulate (distal leaves smaller, lanceolate or linear-lanceolate, bractlike). |
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 | ± 13; corolla laminae ± 15 mm. |
± 8; corolla laminae 9–15 mm. |
Phyllaries | usually ± 21, sometimes ± 13, (8–)10–15 mm, tips usually greenish (often sparsely hairy). |
(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
Calyculi | of 4–8 lanceolate to lance-linear bractlets (lengths mostly less than 1/2 phyllaries). |
of 2–6 bractlets (rarely more than 2 mm). |
Heads | nodding, 1(–2). |
10–30(–60) in corymbiform to subracemiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
= 40, 80. |
Senecio neowebsteri |
Senecio triangularis |
|
Phenology | Flowering late summer–early fall. | Flowering summer. |
Habitat | High talus slopes | Damp places, open woodlands, especially rocky stream banks in coniferous forests |
Elevation | 2200–2600 m (7200–8500 ft) | 100–3300 m (300–10800 ft) |
Distribution |
WA
|
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
|
Discussion | Of conservation concern. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. 553. | FNA vol. 20, p. 566. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. websteri | S. gibbonsii, S. saliens, S. triangularis var. angustifolius |
Name authority | S. F. Blake: Leafl. W. Bot. 8: 143. (1957) | Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) |
Web links |