Senecio triangularis
Senecio mohavensis
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel
Mohave groundsel, Mojave ragwort
glabrous or sparsely floccose-tomentose when young.
(sometimes purple-tinged) glabrous.
single or loosely clustered.
usually 1 (freely branching upward).
evenly distributed; petiolate;
blades narrowly triangular, (3–)4–10+ × 2–6 cm, bases usually ± truncate, sometimes tapered, margins usually dentate, rarely subentire (distal leaves subsessile, smaller).
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).
± 8;
corolla laminae 9–15 mm.
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).
(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black.
± 8 or ± 13, 6–7 mm, tips green.
of 2–6 bractlets (rarely more than 2 mm).
of 3–5+ lance-linear bractlets.
10–30(–60) in corymbiform to subracemiform arrays.
3–10 in loose, cymiform arrays.
glabrous.
hairy.
= 40, 80.
= 40.
Senecio triangularis
Senecio mohavensis
Plants of Senecio triangularis with narrow, subentire leaves that taper to the petioles are occasionally encountered in acid bogs in Oregon and Washington and less frequently elsewhere. They are regarded as edaphic variants; they have been recognized as var. angustifolius.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
BC
CA
OR
WA
Flora NW
PNW Herbaria
SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
