Senecio lemmonii
Senecio spartioides
Lemmon's groundsel, Lemmon's ragwort
broom groundsel, broom senecio, broom-like ragwort, grass-leaf ragwort, many-head groundsel
glabrous or with tufts of white hairs in leaf axils.
usually glabrous, sometimes sparsely, unevenly hairy.
usually 1 (branching distally, unevenly reddish, usually somewhat lax).
usually multiple (branching and arching upward).
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).
evenly distributed (proximal often smaller);
sessile or obscurely petiolate;
blades narrowly linear to filiform (or parted into linear-filiform lobes), 5–10 cm × 1–6 mm, bases ± linear, ultimate margins entire.
usually ± 8 or ± 13, rarely 0;
corolla laminae 8–10 mm.
± 5 (± 13);
corolla laminae 8–12 mm.
± 21, (4–)5–8 mm, tips often with minute black dots.
usually ± 8, sometimes ± 13, (5–)6–9(–10) mm, tips green or minutely black.
of 3–5+ linear to subulate bractlets (to 1.5 mm).
0 or of 1–3+ (minute, inconspicuous) bractlets.
4–12 in loose, corymbiform arrays.
10–20(–60) in compound corymbiform arrays (involucres cylindric or narrowly campanulate, 3–6 mm diam.).
hairy.
usually hirtellous, sometimes glabrous.
= 40.
Senecio lemmonii
Senecio spartioides
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.)
Plants with the leaves parted into lobes that are seldom more than 1 mm wide have been recognized as Senecio spartioides var. multicapitatus (or as S. multicapitatus); expression of the character is inconsistent throughout the range and recognition of the two entities is all but impossible to maintain.
Senecio spartioides apparently hybridizes with S. eremophilus in Garfield County, Utah, and perhaps elsewhere (cf., Holmgren, Reveal, and LaFrance 3463, BRY, KSC, NY). The name Senecio toiyabensis rests upon materials that suggest introgression with S. fremontii. Some specimens usually referred to 41. S. pattersonensis suggest introgression with S. spartioides.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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