|
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel
|
openwoods ragwort
|
| Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). |
Perennials, (20–)30–60 cm (rhizomes branched, spreading or suberect). |
glabrous or sparsely floccose-tomentose when young. |
(unevenly purple-tinged, often glaucous) glabrous. |
single or loosely clustered. |
1–(2–3). |
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, 4–8(–9+) × (2–)3–5 cm, bases tapered, margins dentate to incised-dentate (some denticles callous; mid leaves similar, smaller, ± clasping; distal leaves bractlike). |
± 8; corolla laminae 9–15 mm. |
0. |
(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
(± 5) ± 8, 3–4(–5) mm, tips green or brownish. |
of 2–6 bractlets (rarely more than 2 mm). |
0 or of 1–3+ lance-deltate to lance-linear bractlets (mostly less than 1 mm). |
10–30(–60) in corymbiform to subracemiform arrays. |
25–60+ in cymiform clusters of 3–12. |
glabrous. |
glabrous. |
= 40, 80. |
= 40. |
|
|
|
|
| Flowering summer. |
Flowering late summer–early fall. |
| Damp places, open woodlands, especially rocky stream banks in coniferous forests |
Rocky hillsides and cliffs in coniferous wooded areas |
| 100–3300 m (300–10800 ft) |
1800–2800 m (5900–9200 ft) |
|
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
|
CO; ID; SD; WY
|
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. 553. |
| 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. 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. 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 |
|
| Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) |
Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 409. (1841) |
| |
BC
CA
OR
WA
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