Flora of North America species comparison

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Senecio triangularis

Senecio lyonii

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

island senecio, Lyon's ragwort
Habit Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). Subshrubs or shrubs, (20–)40–150 cm (taproots woody).
Herbage

glabrous or sparsely floccose-tomentose when young.

sparsely hairy, unevenly glabrate (usually with persistent tomentum in leaf axils and on abaxial leaf faces).
Stems

single or loosely clustered.

usually multiple (arching upwards).
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 (proximal withering before flowering);

sessile or obscurely petiolate;

blades ± oblong or elliptic, (4–)6–10(–12) × 1.5–3 cm (1–2-pinnatifid, lobes ± linear, 1–2 mm wide), bases ± linear, ultimate margins entire.
Ray florets

± 8;

corolla laminae 9–15 mm.

± 13;

corolla laminae 8–10 mm.
Phyllaries

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

(± 13) ± 21, (5–)6–8 mm, tips minutely black.
Calyculi

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

0 or of 1–3+ (inconspicuous) bractlets.
Heads

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

4–12 in cymiform arrays (involucres campanulate, 8–15 mm diam.).
Cypselae

glabrous.

hairy.
2n

= 40, 80.

= 40.

Senecio triangularis

Senecio lyonii
Phenology Flowering summer. Flowering spring.
Habitat Damp places, open woodlands, especially rocky stream banks in coniferous forests Ocean bluffs, open hillsides
Elevation 100–3300 m (300–10800 ft) 0–500 m (0–1600 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; Mexico (Baja California)
[WildflowerSearch map]
[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.)

Of conservation concern.

Senecio lyonii is known from the Channel Islands (off the coast of southern California) and south.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 566. FNA vol. 20, p. 560.
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. 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) A. Gray: in A. Gray et al., Syn. Fl. N. Amer. ed. 2, 1(2): 454. (1886)
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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