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Elmer's butterweed, Elmer's ragwort

Habit Perennials, 10–20(–30) cm (rhizomes trailing or branching).
Herbage

unevenly villous-tomentose or floccose, glabrescent.

Stems

single (from loosely clustered basal leaves).

Leaves

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

± 8;

corolla laminae 8–15 mm.

Phyllaries

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

Calyculi

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

Heads

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

Cypselae

glabrous.

2n

= 40.

Senecio elmeri

Phenology Flowering summer.
Habitat Alpine and subalpine rocky sites and talus slopes
Elevation 2000–3000 m (6600–9800 ft)
Distribution
from FNA
WA; BC
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 20, p. 551.
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. 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 Piper: Erythea 7: 173. (1899)
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