Flora of North America species comparison

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Senecio triangularis

Senecio ampullaceus

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

Texas ragwort
Habit Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). Annuals, (10–)20–80 cm (roots relatively thin, branching).
Herbage

glabrous or sparsely floccose-tomentose when young.

loosely arachno-tomentose, unevenly glabrate or glabrescent.
Stems

single or loosely clustered.

single.
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).

progressively reduced distally; petiolate (petioles broadly winged);

blades ovate-lanceolate, 3–8(–10) × (1–)1.5–3(–4) cm, bases tapered or ± truncate, margins dentate to subentire (mid leaves subsessile, lanceolate; distal subulate, bractlike).
Ray florets

± 8;

corolla laminae 9–15 mm.

± 8;

corolla laminae 8–15 mm.
Phyllaries

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

± 13, (6–)7–10 mm, tips green to grayish.
Calyculi

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

of 2–8 bractlets (1–2+ mm).
Heads

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

(1–)10–30 in corymbiform arrays.
Cypselae

glabrous.

hirtellous.
2n

= 40, 80.

Senecio triangularis

Senecio ampullaceus
Phenology Flowering summer. Flowering early–mid spring.
Habitat Damp places, open woodlands, especially rocky stream banks in coniferous forests Open sandy or disturbed sites
Elevation 100–3300 m (300–10800 ft) 100–800 m (300–2600 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
TX
[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.)

Senecio ampullaceus has been reported for Arkansas and Missouri (St. Louis). It is similar to S. quaylei.

(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. 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. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
Synonyms S. gibbonsii, S. saliens, S. triangularis var. angustifolius S. ampullaceus var. floccosus, S. ampullaceus var. glaberrimus
Name authority Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) Hooker: Bot. Mag. 63: plate 3478. (1836)
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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