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Senecio neowebsteri

Olympic Mountain ragwort

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

Habit Perennials, 7–15(–20+) cm (rhizomes fibrous-rooted). Perennials, (15–)20–50(–70) cm (rhizomes branched, ± woody).
Herbage

(sometimes purplish-tinged) floccose-tomentose, unevenly glabrescent.

glabrous.

Stems

single or loosely clustered (erect or arching).

1–(2–4).

Leaves

mostly cauline;

petiolate (petioles about equaling blades);

blades lanceolate or oblanceolate to ovate, (2–)4–8+ × 1.5–3 cm, bases tapered, margins denticulate (distal leaves smaller, lanceolate or linear-lanceolate, bractlike).

(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).

Ray florets

± 13;

corolla laminae ± 15 mm.

± 8 or ± 13;

corolla laminae 5–12 mm.

Phyllaries

usually ± 21, sometimes ± 13, (8–)10–15 mm, tips usually greenish (often sparsely hairy).

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

Calyculi

of 4–8 lanceolate to lance-linear bractlets (lengths mostly less than 1/2 phyllaries).

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

Heads

nodding, 1(–2).

(1–)4–12 in corymbiform arrays.

Cypselae

glabrous.

glabrous.

2n

= 40.

= 40.

Senecio neowebsteri

Senecio crassulus

Phenology Flowering late summer–early fall. Flowering summer.
Habitat High talus slopes Moist to drying hillsides, meadows, other open places in forest associations
Elevation 2200–2600 m (7200–8500 ft) 2200–3700 m (7200–12100 ft)
Distribution
from FNA
WA
[WildflowerSearch map]
[BONAP county map]
from FNA
CO; ID; MT; NM; NV; OR; SD; UT; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

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

Source FNA vol. 20, p. 553. 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. 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. 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
Synonyms S. websteri S. lapathifolius, S. semiamplexicaulis
Name authority S. F. Blake: Leafl. W. Bot. 8: 143. (1957) A. Gray: Proc. Amer. Acad. Arts 19: 54. (1883)
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