Flora of North America species comparison

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Senecio rapifolius

Senecio wootonii

openwoods ragwort

Wooton's butterweed, Wooton's ragwort
Habit Perennials, (20–)30–60 cm (rhizomes branched, spreading or suberect). Perennials, (15–)20–45(–60) cm (caudices erect or weakly spreading).
Herbage

(unevenly purple-tinged, often glaucous) glabrous.

nearly always glaucous, glabrous.
Stems

1–(2–3).

single or clustered.
Leaves

progressively reduced distally; petiolate;

blades ovate to oblanceolate, 4–8(–9+) × (2–)3–5 cm, bases tapered, margins dentate to incised-dentate (some denticles callous; mid leaves similar, smaller, ± clasping; distal leaves bractlike).

(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

0.

8–10;

corolla laminae 4–10 mm.
Phyllaries

(± 5) ± 8, 3–4(–5) mm, tips green or brownish.

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

0 or of 1–3+ lance-deltate to lance-linear bractlets (mostly less than 1 mm).

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

25–60+ in cymiform clusters of 3–12.

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

glabrous.

glabrous.
2n

= 40.

= 40.

Senecio rapifolius

Senecio wootonii
Phenology Flowering late summer–early fall. Flowering spring–summer.
Habitat Rocky hillsides and cliffs in coniferous wooded areas Damp or drying sites, often in rocky, moderately disturbed sites
Elevation 1800–2800 m (5900–9200 ft) 2000–3500 m (6600–11500 ft)
Distribution
from FNA
CO; ID; SD; WY
[WildflowerSearch map]
[BONAP county map]
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. 553. 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. 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. 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. anacletus
Name authority Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 409. (1841) 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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