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Lemmon's groundsel, Lemmon's ragwort

California butterweed, California ragwort

Habit Subshrubs (monocarpic?), (10–)20–100 cm (taproots woody). Annuals, (5–)10–30(–50+) cm (taprooted).
Herbage

glabrous or with tufts of white hairs in leaf axils.

glabrous or sparsely tomentose.

Stems

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

usually single (erect), sometimes 2–6 (branching from bases, arching upward).

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).

(sometimes subsucculent) evenly distributed; ± petiolate (proximal);

blades linear-lanceolate to lanceolate 2–5(–7+) × 0.5–2(–3+) cm, bases tapered, margins subpinnatifid to dentate or subentire (mid and distal leaves sessile, bases clasping).

Ray florets

usually ± 8 or ± 13, rarely 0;

corolla laminae 8–10 mm.

± 13;

corolla laminae 8–11 mm.

Phyllaries

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

± 21 (sometimes fewer), 5–7(–8) mm, tips black.

Calyculi

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

of 5–8+ lanceolate to lance-linear or filiform bractlets (0.5–3 mm, usually inconspicuous).

Heads

4–12 in loose, corymbiform arrays.

usually 3–10(–20+) in open, cymiform arrays, sometimes borne singly (depauperate plants).

Cypselae

hairy.

hirtellous-strigose.

2n

= 40.

Senecio lemmonii

Senecio californicus

Phenology Flowering late winter–early summer. Flowering late winter–spring.
Habitat Rocky sites in deserts Sandy, dry or drying sites, especially near coast
Elevation 500–1000 m (1600–3300 ft) 0–1200 m (0–3900 ft)
Distribution
from FNA
AZ; Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; 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.)

Dwarfish, subsucculent plants of Senecio californicus from near the coast have been recognized as S. ammophilus.

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

Source FNA vol. 20, p. 568. 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. 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
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, S. arizonicus, S. aronicoides, S. astephanus, S. atratus, S. bigelovii, S. blochmaniae, 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. decorticans S. ammophilus, S. californicus var. ammophilus, S. coronopus
Name authority A. Gray: Proc. Amer. Acad. Arts 17: 220. (1882) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 426. (1838)
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