|
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel
|
Elmer's butterweed, Elmer's ragwort
|
| Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). |
Perennials, 10–20(–30) cm (rhizomes trailing or branching). |
glabrous or sparsely floccose-tomentose when young. |
unevenly villous-tomentose or floccose, glabrescent. |
single or loosely clustered. |
single (from loosely clustered basal 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 ovate to oblanceolate, (3–)4–8(–10) × 2–3(–4) cm, bases tapered, margins shallowly dentate (mid and distal leaves smaller, bractlike, often clasping). |
± 8; corolla laminae 9–15 mm. |
± 8; corolla laminae 8–15 mm. |
(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
(± 8) ± 13, 8–10 mm, tips black (villous). |
of 2–6 bractlets (rarely more than 2 mm). |
of 2–7 lance-linear to linear bractlets (lengths 1/3–2/3 phyllaries). |
10–30(–60) in corymbiform to subracemiform arrays. |
erect or weakly nodding (especially in bud), (2–)5–9(–12) in loose, cymiform arrays. |
glabrous. |
glabrous. |
= 40, 80. |
= 40. |
|
|
|
|
| Flowering summer. |
Flowering summer. |
| Damp places, open woodlands, especially rocky stream banks in coniferous forests |
Alpine and subalpine rocky sites and talus slopes |
| 100–3300 m (300–10800 ft) |
2000–3000 m (6600–9800 ft) |
|
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
|
WA; BC
|
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.) |
|
| FNA vol. 20, p. 566. |
FNA vol. 20, p. 551. |
| Asteraceae > tribe Senecioneae > Senecio |
Asteraceae > tribe Senecioneae > Senecio |
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, S. arizonicus, S. aronicoides, S. astephanus, S. atratus, S. bigelovii, S. blochmaniae, S. californicus, S. cannabifolius, S. clarkianus, S. crassulus, S. elegans, S. elmeri, S. eremophilus, S. ertterae, S. erucifolius, S. flaccidus, S. fremontii, S. hydrophiloides, S. hydrophilus, S. integerrimus, S. jacobaea, S. lemmonii, S. lugens, S. lyonii, S. megacephalus, S. mohavensis, S. multidentatus, S. neowebsteri, S. parryi, S. pattersonensis, S. pseudoarnica, S. pudicus, S. quaylei, S. rapifolius, S. riddellii, S. sacramentanus, S. scorzonella, S. serra, S. sheldonensis, S. soldanella, S. spartioides, S. sphaerocephalus, S. spribillei, S. squalidus, S. sylvaticus, S. taraxacoides, S. viscosus, S. vulgaris, S. warnockii, S. wootonii |
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, S. arizonicus, S. aronicoides, S. astephanus, S. atratus, S. bigelovii, S. blochmaniae, S. californicus, S. cannabifolius, S. clarkianus, S. crassulus, S. elegans, S. eremophilus, S. ertterae, S. erucifolius, S. flaccidus, S. fremontii, S. hydrophiloides, S. hydrophilus, S. integerrimus, S. jacobaea, S. lemmonii, S. lugens, S. lyonii, S. megacephalus, S. mohavensis, S. multidentatus, S. neowebsteri, S. parryi, S. pattersonensis, S. pseudoarnica, S. pudicus, S. quaylei, S. rapifolius, S. riddellii, S. sacramentanus, S. scorzonella, S. serra, S. sheldonensis, S. soldanella, S. spartioides, S. sphaerocephalus, S. spribillei, S. squalidus, S. sylvaticus, S. taraxacoides, S. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii |
| S. gibbonsii, S. saliens, S. triangularis var. angustifolius |
S. crepidineus |
| Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) |
Piper: Erythea 7: 173. (1899) |
| |
BC
CA
OR
WA
Flora NW
PNW Herbaria
SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
