Senecio triangularis
Senecio spartioides
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel
broom groundsel, broom senecio, broom-like ragwort, grass-leaf ragwort, many-head groundsel
glabrous or sparsely floccose-tomentose when young.
usually glabrous, sometimes sparsely, unevenly hairy.
single or loosely clustered.
usually multiple (branching and arching 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).
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.
± 8;
corolla laminae 9–15 mm.
± 5 (± 13);
corolla laminae 8–12 mm.
(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black.
usually ± 8, sometimes ± 13, (5–)6–9(–10) mm, tips green or minutely black.
of 2–6 bractlets (rarely more than 2 mm).
0 or of 1–3+ (minute, inconspicuous) bractlets.
10–30(–60) in corymbiform to subracemiform arrays.
10–20(–60) in compound corymbiform arrays (involucres cylindric or narrowly campanulate, 3–6 mm diam.).
glabrous.
usually hirtellous, sometimes glabrous.
= 40, 80.
= 40.
Senecio triangularis
Senecio spartioides
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.)
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.)
BC
CA
OR
WA
Flora NW
PNW Herbaria
SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
