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Arizona ragwort

hoary ragwort

Habit Perennials, (20–)30–40(–60) cm (rhizomes suberect or weakly spreading). Perennials, 30–120 cm (rhizomes branched, sometimes producing stolons).
Herbage

lanate-arachnose or tomentose, unevenly glabrescent.

floccose-tomentose, unevenly glabrescent (persistently hairy on abaxial leaf faces).

Stems

1(–2).

usually single, sometimes loosely clustered.

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 (basal and proximal sometimes withering before flowering);

petiolate (proximal) or sessile;

blades ovoid or oblong to spatulate (usually pinnatifid to pinnatisect, lobes ± lanceolate to linear), (3–)5–12 × (1.5–)2–4 cm, bases tapered to ± truncate, ultimate margins (often revolute) dentate or entire.

Ray florets

± 13;

corolla laminae 5–10 mm.

± 13;

corolla laminae 12–15 mm.

Phyllaries

(± 13) ± 21, 5–7 mm, tips green.

± 13, 5–7 mm, tips green or greenish.

Calyculi

of 2–5+ bractlets (largest to 3 mm).

of 4–6(–10) bractlets (lengths to 1/2 phyllaries).

Heads

(2–)5–12(–20) in corymbiform arrays.

20–60 in corymbiform arrays.

Cypselae

hairy (especially on angles).

hairy.

2n

= 40.

Senecio arizonicus

Senecio erucifolius

Phenology Flowering late spring–summer. Flowering summer.
Habitat Openings in pine-oak woodlands Waste grounds
Elevation 1600–2100 m (5200–6900 ft) 0–200+ m (0–700+ ft)
Distribution
from FNA
AZ
[WildflowerSearch map]
[BONAP county map]
from FNA
PA; Old World [Introduced in North America]
[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 erucifolius has been introduced occasionally around seaports and has persisted. At present, it appears to be uncommon and highly localized; it should be expected almost any place that its close relative, Senecio jacobaea, occurs.

Senecio erucifolius was treated in Jacobaea by E. Wiebe (2000); see discussion under 53. S. jacobaea.

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

Source FNA vol. 20, p. 555. FNA vol. 20, p. 569.
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. clarkianus, S. crassulus, S. elegans, S. elmeri, S. eremophilus, S. ertterae, 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 Jacobaea erucifolia
Name authority Greene: Bull. Torrey Bot. Club 10: 87. (1883) Linnaeus: Fl. Suec. ed. 2, 291. (1755)
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