Flora of North America species comparison

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Senecio triangularis

Senecio sheldonensis

arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel

Mount Sheldon butterweed, Mount Sheldon ragwort, Mt. Sheldon ragwort
Habit Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). Perennials, 30–40(–50) cm (caudices branched, fibrous-rooted).
Herbage

glabrous or sparsely floccose-tomentose when young.

glabrous or with scattered hairs near leaf bases and among heads.
Stems

single or loosely clustered.

single or loosely clustered.
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).

evenly distributed;

petiolate or subsessile;

blades lanceolate, 4–10 × 2–4 cm, bases ± tapered, margins denticulate (distal leaves sessile, smaller).
Ray florets

± 8;

corolla laminae 9–15 mm.

± 8;

corolla laminae ± 10 mm.
Phyllaries

(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black.

± 13, 7–10 mm, tips black (hairy).
Calyculi

of 2–6 bractlets (rarely more than 2 mm).

of 3–7 bractlets (0.5–3 mm).
Heads

10–30(–60) in corymbiform to subracemiform arrays.

(1–)3–5(–6) in cymiform arrays.
Cypselae

glabrous.

glabrous.
2n

= 40, 80.

Senecio triangularis

Senecio sheldonensis
Phenology Flowering summer. Flowering late Jul–mid Aug.
Habitat Damp places, open woodlands, especially rocky stream banks in coniferous forests Subalpine meadows and valleys
Elevation 100–3300 m [300–10800 ft] 1200–1800 m [3900–5900 ft]
Distribution
from FNA
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
[WildflowerSearch map]
[BONAP county map]
from FNA
BC; NT; YT
[BONAP county map]
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.)

Senecio sheldonensis is infrequently collected and poorly understood. The treatment here is provisional.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 566. Treatment author: Theodore M. Barkley†. FNA vol. 20, p. 567. Treatment author: Theodore M. Barkley†.
Parent taxa Asteraceae > tribe Senecioneae > Senecio Asteraceae > tribe Senecioneae > Senecio
Sibling taxa
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. rapifolius, S. riddellii, S. sacramentanus, S. scorzonella, S. serra, S. soldanella, S. spartioides, S. sphaerocephalus, S. spribillei, S. squalidus, S. sylvaticus, S. taraxacoides, S. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
Synonyms S. gibbonsii, S. saliens, S. triangularis var. angustifolius
Name authority Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) A. E. Porsild: Canad. Field-Naturalist 64: 43. (1950)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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