|
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel
|
Blochman's ragwort, dune ragwort
|
| Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). |
Subshrubs, 45–130 cm (taproots forming woody crowns). |
glabrous or sparsely floccose-tomentose when young. |
glabrous or sparsely hairy. |
single or loosely clustered. |
usually multiple (arching upwards). |
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). |
evenly distributed (often crowded; proximal often withering and pendulous); sessile or ± petiolate; blades linear-filiform, 3–12 cm × 1–3 mm, bases ± linear, margins entire. |
± 8; corolla laminae 9–15 mm. |
± 8; corolla laminae 8–10 mm. |
(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
± 13, 7–10 mm, tips green. |
of 2–6 bractlets (rarely more than 2 mm). |
0 or of 1–3+ lance-deltate to linear bractlets (lengths to 1/4 phyllaries). |
10–30(–60) in corymbiform to subracemiform arrays. |
5–20 in corymbiform arrays (involucres campanulate). |
glabrous. |
hirtellous (canescent). |
= 40, 80. |
= 40. |
|
|
|
|
| Flowering summer. |
Flowering summer–early fall. |
| Damp places, open woodlands, especially rocky stream banks in coniferous forests |
Coastal sand dunes and sandy, open flood plains |
| 100–3300 m [300–10800 ft] |
0–100 m [0–300 ft] |
|
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
|
CA
|
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.) |
Of conservation concern. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
| FNA vol. 20, p. 566. Treatment author: Theodore M. Barkley†. |
FNA vol. 20, p. 560. Treatment author: Theodore M. Barkley†. |
| 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. 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. 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) |
Greene: Erythaea 1: 7. (1893) |
| |
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