Senecio lemmonii |
Senecio californicus |
|
---|---|---|
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 |
AZ; Mexico
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CA; Mexico
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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 | ||
Sibling taxa | ||
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) |
Web links |