Difference between revisions of "Senecio mohavensis"
in A. Gray et al., Syn. Fl. N. Amer. 1(2): 446. 1884.
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|accepted_name=Senecio mohavensis | |accepted_name=Senecio mohavensis | ||
| − | |accepted_authority=Torrey & A. Gray | + | |accepted_authority=Torrey & A. Gray |
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name=Senecio mohavensis | name=Senecio mohavensis | ||
| − | + | |authority=Torrey & A. Gray | |
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|rank=species | |rank=species | ||
|parent rank=genus | |parent rank=genus | ||
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|publication year=1884 | |publication year=1884 | ||
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|tribe=Asteraceae tribe Senecioneae | |tribe=Asteraceae tribe Senecioneae | ||
|genus=Senecio | |genus=Senecio | ||
Latest revision as of 19:59, 5 November 2020
Annuals, 10–30(–40) cm (taproots often twisted). Herbage (sometimes purple-tinged) glabrous. Stems usually 1 (freely branching upward). Leaves equally distributed; petiolate; blades ovate to obovate, 2–6 × 0.5–2(–4) cm, bases tapered, margins coarsely lobed or irregularly dentate (mid and distal leaves similar, bases expanded, truncate to cordate, clasping, 1–2 cm across). Heads 3–10 in loose, cymiform arrays. Calyculi of 3–5+ lance-linear bractlets. Phyllaries ± 8 or ± 13, 6–7 mm, tips green. Ray florets 0 or 1–3+; corolla laminae 0.1–1 mm (little expanded, barely, if at all, surpassing phyllaries; sometimes laminae 0 and heads perhaps technically disciform). Cypselae hairy. 2n = 40.
Phenology: Flowering spring.
Habitat: Sandy or rocky washes, desert flats
Elevation: 100–700 m
Distribution
Ariz., Calif., Nev., Mexico (Sonora).
Discussion
Senecio mohavensis is similar to S. flavus (Decaisne) Schultz-Bipontinus of the Mediterranean region and southwest Asia, which raises phytogeographic questions (cf. A. Liston et al. 1989; Liston and J. W. Kadereit 1995; M. Coleman et al. 2001). The last cited study showed that a previously recognized variety of S. flavus is more closely related to S. mohavensis than to S. flavus and a new combination was made: S. mohavensis subsp. brevifolius (Kadereit) M. Coleman.