Flora of North America species comparison

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Senecio sacramentanus

Senecio elmeri

Sacramento ragwort

Elmer's butterweed, Elmer's ragwort
Habit Perennials, 20–50 cm (caudices fibrous-rooted). Perennials, 10–20(–30) cm (rhizomes trailing or branching).
Herbage

sparsely pubescent to tomentose (especially on abaxial leaf faces and among heads).

unevenly villous-tomentose or floccose, glabrescent.
Stems

single or loosely clustered.

single (from loosely clustered basal leaves).
Leaves

progressively reduced distally;

petiolate;

blades triangular, triangular-lanceolate, or lanceolate, 3–10(–15) × 1.5–4 cm, bases cordate to truncate or tapered, margins serrate or dentate (mid and distal leaves sessile, bractlike).

progressively reduced distally; ± petiolate;

blades ovate to oblanceolate, (3–)4–8(–10) × 2–3(–4) cm, bases tapered, margins shallowly dentate (mid and distal leaves smaller, bractlike, often clasping).
Ray florets

0.

± 8;

corolla laminae 8–15 mm.
Phyllaries

± 8, 6–9 mm, tips green.

(± 8) ± 13, 8–10 mm, tips black (villous).
Calyculi

of 2–5+ lance-deltate to filiform bractlets (lengths 1/5–1/2 phyllaries).

of 2–7 lance-linear to linear bractlets (lengths 1/3–2/3 phyllaries).
Heads

nodding, 6–10+ in racemiform-paniculiform arrays.

erect or weakly nodding (especially in bud), (2–)5–9(–12) in loose, cymiform arrays.
Cypselae

glabrous.

glabrous.
2n

= 40.

Senecio sacramentanus

Senecio elmeri
Phenology Late summer. Flowering summer.
Habitat Montane meadows Alpine and subalpine rocky sites and talus slopes
Elevation 3000–3500 m (9800–11500 ft) 2000–3000 m (6600–9800 ft)
Distribution
from FNA
NM
[BONAP county map]
from FNA
WA; BC
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 20, p. 550. FNA vol. 20, p. 551.
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. 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. 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. crepidineus
Name authority Wooton & Standley: Contr. U.S. Natl. Herb. 16: 194. (1913) Piper: Erythea 7: 173. (1899)
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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