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mountain meadow butterweed, thick-leaf groundsel, thick-leaf ragwort

Wooton's butterweed, Wooton's ragwort

Habit Perennials, (15–)20–50(–70) cm (rhizomes branched, ± woody). Perennials, (15–)20–45(–60) cm (caudices erect or weakly spreading).
Herbage

glabrous.

nearly always glaucous, glabrous.

Stems

1–(2–4).

single or clustered.

Leaves

(thickish-turgid) progressively reduced distally; petiolate;

blades broadly lanceolate to subelliptic, 2.5–15 × 1–5 cm, bases tapered, margins sharply dentate to subentire (some teeth callous; mid leaves sometimes larger than proximal; distal leaves sessile, smaller, often clasping).

(thickish and turgid) progressively reduced distally; petiolate;

blades ovate or obovate to lanceolate, 4–9(–15+) × 1.5–3(–4+) cm, bases tapered, margins wavy or subentire (often with callous denticles; mid and distal leaves sessile, bractlike).

Ray florets

± 8 or ± 13;

corolla laminae 5–12 mm.

8–10;

corolla laminae 4–10 mm.

Phyllaries

(± 8) ± 13 or ± 21, 5–9 mm, tips black (villous).

± 13 (± 21), 6–9 mm, tips green to brownish (not blackened).

Calyculi

of (1–)3–6 linear to filiform bractlets (lengths to 1/3 phyllaries).

of 1–3+ oblong to lance-linear bractlets (less than 3 mm).

Heads

(1–)4–12 in corymbiform arrays.

(3–)8–24+ in corymbiform arrays.

Cypselae

glabrous.

glabrous.

2n

= 40.

= 40.

Senecio crassulus

Senecio wootonii

Phenology Flowering summer. Flowering spring–summer.
Habitat Moist to drying hillsides, meadows, other open places in forest associations Damp or drying sites, often in rocky, moderately disturbed sites
Elevation 2200–3700 m (7200–12100 ft) 2000–3500 m (6600–11500 ft)
Distribution
from FNA
CO; ID; MT; NM; NV; OR; SD; UT; WY
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; NM; TX; Mexico
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[BONAP county map]
Discussion

Senecio wootonii reaches its southern limit in Coahuila and Chihuahua, Mexico; farther south, it is replaced by S. toluccanus de Candolle, a similar, larger, more robust species.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 20, p. 551. FNA vol. 20, p. 554.
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. 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
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. triangularis, S. viscosus, S. vulgaris, S. warnockii
Synonyms S. lapathifolius, S. semiamplexicaulis S. anacletus
Name authority A. Gray: Proc. Amer. Acad. Arts 19: 54. (1883) Greene: Bull. Torrey Bot. Club 25: 122, plate 331, figs. 1, 2. (1898)
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