Flora of North America species comparison

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Senecio arizonicus

Senecio ertterae

Arizona ragwort

ertter's groundsel, ertter's ragwort
Habit Perennials, (20–)30–40(–60) cm (rhizomes suberect or weakly spreading). Annuals, 20–50(–60+) cm (taproots relatively thin, twisted).
Herbage

lanate-arachnose or tomentose, unevenly glabrescent.

(± turgid or subsucculent) unevenly villous-tomentose, glabrescent.
Stems

1(–2).

usually single, rarely 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).

progressively reduced distally (basal usually withering before flowering);

petiolate (petioles winged);

blades oblanceolate to spatulate, 4–7 × 1.5–3 cm, bases tapered, margins incised (distal leaves sessile, bractlike).
Ray florets

± 13;

corolla laminae 5–10 mm.

± 8 (± 13?);

corolla laminae 5–6 mm.
Phyllaries

(± 13) ± 21, 5–7 mm, tips green.

± 13, 6–7 mm, tips green.
Calyculi

of 2–5+ bractlets (largest to 3 mm).

of 1–5+ linear to subulate bractlets (to 4 mm).
Heads

(2–)5–12(–20) in corymbiform arrays.

6–10(–20) in cymiform arrays.
Cypselae

hairy (especially on angles).

usually hairy (especially on angles), sometimes glabrous.
2n

= 40.

= 40.

Senecio arizonicus

Senecio ertterae
Phenology Flowering late spring–summer. Flowering late summer–early fall.
Habitat Openings in pine-oak woodlands Talus slopes of greenish yellow ash tuff
Elevation 1600–2100 m (5200–6900 ft) 900–1200 m (3000–3900 ft)
Distribution
from FNA
AZ
[WildflowerSearch map]
[BONAP county map]
from FNA
OR
[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.)

Of conservation concern.

Senecio erterrae is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 555. FNA vol. 20, p. 561.
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. 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) T. M. Barkley: in N. L. Britton et al., N. Amer. Fl., ser. 2, 10: 124. (1978)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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