Flora of North America species comparison

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Senecio triangularis

Senecio elegans

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

purple ragwort, red-purple ragwort
Habit Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). Annuals, 20–40(–60) cm (taprooted).
Herbage

glabrous or sparsely floccose-tomentose when young.

(somewhat sticky) hairy or unevenly glabrate.
Stems

single or loosely clustered.

single (often branching distally).
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 (petiole bases ± expanded);

blades obovate (lyrate to pinnatifid, lobes linear to ± cruciate), 3–8 × 1.5–3.5 cm, bases contracted or tapered, ultimate margins ± dentate to crenate.
Ray florets

± 8;

corolla laminae 9–15 mm.

± 13;

corolla laminae (deep red to purple) 10–15 mm.
Phyllaries

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

± 13+, 6–10 mm, tips black.
Calyculi

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

of 8–14 ± ovate bractlets (lengths to 1/2 phyllaries).
Heads

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

8–20 in corymbiform arrays.
Cypselae

glabrous.

usually hairy.
2n

= 40, 80.

= 20.

Senecio triangularis

Senecio elegans
Phenology Flowering summer. Flowering mostly spring–summer (sparingly at other times).
Habitat Damp places, open woodlands, especially rocky stream banks in coniferous forests Disturbed coastal sites
Elevation 100–3300 m (300–10800 ft) 0–100 m (0–300 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
CA; Africa [Introduced in North America]
[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 elegans escapes from cultivation and persists along the central coast of California. Native to South Africa, it is now established widely in areas of Mediterranean climate.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 566. FNA vol. 20, p. 567.
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. 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
Synonyms S. gibbonsii, S. saliens, S. triangularis var. angustifolius
Name authority Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) Linnaeus: Sp. Pl. 2: 869. (1753)
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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