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Lemmon's groundsel, Lemmon's ragwort

Habit Subshrubs (monocarpic?), (10–)20–100 cm (taproots woody).
Herbage

glabrous or with tufts of white hairs in leaf axils.

Stems

usually 1 (branching distally, unevenly reddish, usually somewhat lax).

Leaves

evenly distributed;

petiolate (proximal) or sessile;

blades lanceolate to lance-linear, 3–10+ × (0.5–)1–2 cm, bases tapered (or auriculate), margins (sometimes revolute) unevenly dentate to subentire (mid and distal leaves similar, smaller, bases expanded, ± truncate to cordate, clasping).

Ray florets

usually ± 8 or ± 13, rarely 0;

corolla laminae 8–10 mm.

Phyllaries

± 21, (4–)5–8 mm, tips often with minute black dots.

Calyculi

of 3–5+ linear to subulate bractlets (to 1.5 mm).

Heads

4–12 in loose, corymbiform arrays.

Cypselae

hairy.

Senecio lemmonii

Phenology Flowering late winter–early summer.
Habitat Rocky sites in deserts
Elevation 500–1000 m (1600–3300 ft)
Distribution
from FNA
AZ; Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Some young or depauperate specimens of Senecio lemmonii from northern Mexico resemble S. californicus, which occurs farther to the west in California and Baja California. Whether or not there is a relationship between the two is undetermined.

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

Source FNA vol. 20, p. 568.
Parent taxa 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. 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. decorticans
Name authority A. Gray: Proc. Amer. Acad. Arts 17: 220. (1882)
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