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

San Gabriel ragwort

Habit Perennials, (15–)20–50(–70) cm (rhizomes branched, ± woody). Perennials, 40–100 cm (caudices unknown).
Herbage

glabrous.

unevenly floccose-lanate or tomentose, glabrescent.

Stems

1–(2–4).

single.

Leaves

(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).

progressively reduced distally; petiolate;

blades elliptic-ovate to lanceolate, 10–20(–30?) × 3–7+ cm, bases tapered, margins dentate to denticulate (teeth cartilaginous; mid leaves similar, sessile, smaller; distal leaves bractlike).

Ray florets

± 8 or ± 13;

corolla laminae 5–12 mm.

0.

Phyllaries

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

± 21, 7–8 mm, tips greenish.

Calyculi

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

of 5–8+ lance-linear to filiform bractlets (lengths 1/3–7/8 phyllaries).

Heads

(1–)4–12 in corymbiform arrays.

10–20+ in loose or congested, cymiform arrays.

Cypselae

glabrous.

glabrous.

2n

= 40.

= 40.

Senecio crassulus

Senecio astephanus

Phenology Flowering summer. Flowering spring.
Habitat Moist to drying hillsides, meadows, other open places in forest associations Steep, rocky slopes
Elevation 2200–3700 m (7200–12100 ft) 400–1500 m (1300–4900 ft)
Distribution
from FNA
CO; ID; MT; NM; NV; OR; SD; UT; WY
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[BONAP county map]
Discussion

Of conservation concern.

Senecio astephanus is collected infrequently.

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

Source FNA vol. 20, p. 551. FNA vol. 20, p. 553.
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. 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
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, S. arizonicus, S. aronicoides, 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, S. wootonii
Synonyms S. lapathifolius, S. semiamplexicaulis
Name authority A. Gray: Proc. Amer. Acad. Arts 19: 54. (1883) Greene: Pittonia 1: 174. (1888)
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