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

bashful ragwort

Habit Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). Perennials or biennials (possibly winter annuals), 50–80 cm (caudices fibrous-rooted).
Herbage

glabrous or sparsely floccose-tomentose when young.

glabrous.

Stems

single or loosely clustered.

usually single, sometimes 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).

progressively reduced distally; petiolate;

blades narrowly lanceolate to oblanceolate, 8–15(–20+) × (0.5–)1–3(–4) cm, bases tapered, margins entire or dentate (mid and distal leaves sessile, bractlike).

Ray florets

± 8;

corolla laminae 9–15 mm.

0.

Phyllaries

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

usually ± 13, rarely ± 8, 5–9 mm, tips green.

Calyculi

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

of 2–6 lance-linear bractlets.

Heads

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

nodding, (3–)8–16(–40+) in racemiform or paniculiform arrays.

Cypselae

glabrous.

glabrous.

2n

= 40, 80.

Senecio triangularis

Senecio pudicus

Phenology Flowering summer. Flowering summer–early autumn.
Habitat Damp places, open woodlands, especially rocky stream banks in coniferous forests Rocky, damp or drying hillsides, often coniferous and aspen woodlands
Elevation 100–3300 m (300–10800 ft) 2400–3800 m (7900–12500 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
CO; NM; UT
[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.)

Source FNA vol. 20, p. 566. FNA vol. 20, p. 550.
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. 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. cernuus, Ligularia pudica
Name authority Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) Greene: Pittonia 4: 118. (1900)
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