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Arizona ragwort

Clark's ragwort

Habit Perennials, (20–)30–40(–60) cm (rhizomes suberect or weakly spreading). Perennials, (50–)60–100(–120) cm (caudices fibrous-rooted).
Herbage

lanate-arachnose or tomentose, unevenly glabrescent.

sparsely floccose-tomentose, unevenly glabrescent.

Stems

1(–2).

single.

Leaves

(often purplish abaxially) reduced distally;

petiolate;

blades ovate to subelliptic, (5–)6–10(–15) × (2.5–)3–5(–9) cm, bases tapered or contracted, margins subentire to denticulate (denticles callous; mid and distal leaves bractlike).

evenly distributed;

petiolate;

well-developed mid leaves: blades lanceolate to oblong,(8–)10–15(–18) × (2–)3–5(–9) cm overall, margins deeply dentate or irregularly pinnate-lobed to laciniate;

distal leaves sessile, weakly clasping.

Ray florets

± 13;

corolla laminae 5–10 mm.

± 8 or ± 13;

corolla laminae 8–12(–20) mm.

Phyllaries

(± 13) ± 21, 5–7 mm, tips green.

± 13 or ± 21, 5–8 mm, tips green.

Calyculi

of 2–5+ bractlets (largest to 3 mm).

of 3–8+ linear to filiform bractlets (lengths 1/2–3/4+ phyllaries).

Heads

(2–)5–12(–20) in corymbiform arrays.

8–20 in corymbiform arrays.

Cypselae

hairy (especially on angles).

glabrous.

2n

= 40.

Senecio arizonicus

Senecio clarkianus

Phenology Flowering late spring–summer. Flowering late summer.
Habitat Openings in pine-oak woodlands Moist meadows, conifer-dominated sites
Elevation 1600–2100 m (5200–6900 ft) 1400–2700 m (4600–8900 ft)
Distribution
from FNA
AZ
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Senecio arizonicus is reputedly in southern New Mexico (W. C. Martin and C. R. Hutchins 1980); that seems unlikely and should be checked.

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

Senecio clarkianus grows on west slopes of the central and southern Sierra Nevada.

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

Source FNA vol. 20, p. 555. FNA vol. 20, p. 566.
Parent taxa Asteraceae > tribe Senecioneae > Senecio Asteraceae > tribe Senecioneae > Senecio
Sibling taxa
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, 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, 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. 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
Name authority Greene: Bull. Torrey Bot. Club 10: 87. (1883) A. Gray: Proc. Amer. Acad. Arts 7: 362. (1868)
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