Senecio spartioides
Senecio warnockii
broom groundsel, broom senecio, broom-like ragwort, grass-leaf ragwort, many-head groundsel
Warnock's ragwort
usually glabrous, sometimes sparsely, unevenly hairy.
closely, unevenly lanate-floccose, glabrescent.
usually multiple (branching and arching upward).
usually multiple (strict or nearly so, arching-erect).
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.
(often recurved and thickish-turgid) concentrated distally on stems;
sessile or obscurely petiolate;
blades narrowly linear to filiform (2–7 cm × 1 mm), bases ± linear, margins entire.
± 5 (± 13);
corolla laminae 8–12 mm.
usually ± 8, rarely 0;
corolla laminae 5–10 mm.
usually ± 8, sometimes ± 13, (5–)6–9(–10) mm, tips green or minutely black.
± 13, 5–8 mm, tips green or minutely black.
0 or of 1–3+ (minute, inconspicuous) bractlets.
0 or of 3–5 bractlets (lengths less than 1/2 phyllaries).
10–20(–60) in compound corymbiform arrays (involucres cylindric or narrowly campanulate, 3–6 mm diam.).
3–10 in corymbiform arrays (involucres weakly campanulate).
usually hirtellous, sometimes glabrous.
glabrous.
= 40.
Senecio spartioides
Senecio warnockii
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.)
Of conservation concern.
Senecio warnockii is infrequently collected; additional study may show it to be an edaphic phase of S. flaccidus. The restriction to gypseous soils and the gross aspect combine to make it distinctive.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
