Flora of North America species comparison

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Senecio mohavensis

Mohave groundsel, Mojave ragwort
Habit 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).
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).
Phyllaries

± 8 or ± 13, 6–7 mm, tips green.
Calyculi

of 3–5+ lance-linear bractlets.
Heads

3–10 in loose, cymiform arrays.
Cypselae

hairy.
2n

= 40.

Senecio mohavensis
Phenology Flowering spring.
Habitat Sandy or rocky washes, desert flats
Elevation 100–700 m (300–2300 ft)
Distribution
from FNA
AZ; CA; NV; Mexico (Sonora)
[WildflowerSearch map]
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 563.
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. lemmonii, S. lugens, S. lyonii, S. megacephalus, 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 Torrey & A. Gray: in A. Gray et al., Syn. Fl. N. Amer. 1(2): 446. (1884)
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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