Senecio serra var. admirabilis
Senecio serra
tall ragwort
butterweed groundsel, sawtooth groundsel, serrated ragwort, tall butterweed, tall ragwort
glabrous or lightly floccose-tomentose proximally when young.
single or loosely clustered.
evenly distributed (proximal often withering before flowering);
petiolate or subsessile;
blades lanceolate or narrowly lanceolate to sublinear, 5–15(–20+) × (1–)1.5–4 cm, bases tapered, margins dentate to subentire (distal leaves smaller, bractlike).
± 8;
corolla laminae 7–10 mm.
± 5 or ± 8;
corolla laminae 5–10 mm.
20–40+.
± 13, 7–9 mm.
± 8 or ca. 13, 4–9 mm, tips usually green, sometimes black.
of 2–6 linear to filiform bractlets (0.5–5 mm).
(12–)30–50.
30–90+ in corymbiform to subpaniculiform arrays.
glabrous or glabrate.
= 40.
Senecio serra var. admirabilis
Senecio serra
Of conservation concern.
Variety admirabilis occurs on the southern Rocky Mountains of Wyoming and Colorado and in the La Sal Mountains of Utah.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 2 (2 in the flora).
Varieties of Senecio serra are distinguished by head size and distribution.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Heads 40–90+; phyllaries ± 8, 4–6 mm; ray florets ± 5, corolla laminae 5–7 mm; disc florets 10–20 | var. serra |
1. Heads (12–)30–50; phyllaries ± 13, 7–9 mm; ray florets ± 8, corolla laminae 7–10 mm; disc florets 20–40+ | var. admirabilis |
SW CO Wildflowers
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