Flora of North America species comparison

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Senecio wootonii

Wooton's butterweed, Wooton's ragwort
Habit Perennials, (15–)20–45(–60) cm (caudices erect or weakly spreading).
Herbage

nearly always glaucous, glabrous.
Stems

single or clustered.
Leaves

(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

8–10;

corolla laminae 4–10 mm.
Phyllaries

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

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

(3–)8–24+ in corymbiform arrays.
Cypselae

glabrous.
2n

= 40.

Senecio wootonii
Phenology Flowering spring–summer.
Habitat Damp or drying sites, often in rocky, moderately disturbed sites
Elevation 2000–3500 m (6600–11500 ft)
Distribution
from FNA
AZ; CO; NM; TX; Mexico
[WildflowerSearch map]
[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. 554.
Parent taxa 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. triangularis, S. viscosus, S. vulgaris, S. warnockii
Synonyms S. anacletus
Name authority Greene: Bull. Torrey Bot. Club 25: 122, plate 331, figs. 1, 2. (1898)
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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