Flora of North America species comparison

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Senecio triangularis

Senecio californicus

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

California butterweed, California ragwort
Habit Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). Annuals, (5–)10–30(–50+) cm (taprooted).
Herbage

glabrous or sparsely floccose-tomentose when young.

glabrous or sparsely tomentose.
Stems

single or loosely clustered.

usually single (erect), sometimes 2–6 (branching from bases, arching upward).
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).

(sometimes subsucculent) evenly distributed; ± petiolate (proximal);

blades linear-lanceolate to lanceolate 2–5(–7+) × 0.5–2(–3+) cm, bases tapered, margins subpinnatifid to dentate or subentire (mid and distal leaves sessile, bases clasping).
Ray florets

± 8;

corolla laminae 9–15 mm.

± 13;

corolla laminae 8–11 mm.
Phyllaries

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

± 21 (sometimes fewer), 5–7(–8) mm, tips black.
Calyculi

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

of 5–8+ lanceolate to lance-linear or filiform bractlets (0.5–3 mm, usually inconspicuous).
Heads

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

usually 3–10(–20+) in open, cymiform arrays, sometimes borne singly (depauperate plants).
Cypselae

glabrous.

hirtellous-strigose.
2n

= 40, 80.

= 40.

Senecio triangularis

Senecio californicus
Phenology Flowering summer. Flowering late winter–spring.
Habitat Damp places, open woodlands, especially rocky stream banks in coniferous forests Sandy, dry or drying sites, especially near coast
Elevation 100–3300 m (300–10800 ft) 0–1200 m (0–3900 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
[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.)

Dwarfish, subsucculent plants of Senecio californicus from near the coast have been recognized as S. ammophilus.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 566. FNA vol. 20, p. 561.
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. 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
Synonyms S. gibbonsii, S. saliens, S. triangularis var. angustifolius S. ammophilus, S. californicus var. ammophilus, S. coronopus
Name authority Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 426. (1838)
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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