Senecio wootonii
Senecio bigelovii
Wooton's butterweed, Wooton's ragwort
nodding groundsel, nodding ragwort
nearly always glaucous, glabrous.
usually floccose-tomentose to glabrescent, sometimes glabrous.
single or clustered.
single or loosely clustered.
(thickish and turgid) progressively reduced distally;
petiolate;
blades ovate or obovate to lanceolate, 4–9(–15+) × 1.5–3(–4+) cm, bases tapered, margins wavy or subentire (often with callous denticles; mid and distal leaves sessile, bractlike).
progressively reduced distally;
petiolate (proximal);
blades ovate to lanceolate, 7–15 × (1–)2–5 cm, bases contracted or tapered, margins subentire or serrate to dentate (mid and distal leaves similar, sessile, bractlike, often clasping).
8–10;
corolla laminae 4–10 mm.
0.
± 13 (± 21), 6–9 mm, tips green to brownish (not blackened).
± 13 or ± 21, 6–12 mm, tips green.
of 1–3+ oblong to lance-linear bractlets (less than 3 mm).
of 4–10 linear bractlets (lengths mostly 1/3–1/2 phyllaries, sometimes 1 or 2 equaling phyllaries).
(3–)8–24+ in corymbiform arrays.
nodding (especially when young), (1–)3–12(–20) in racemiform or paniculiform arrays (terminal heads often largest).
glabrous.
glabrous.
= 40.
= 40.
Senecio wootonii
Senecio bigelovii
Senecio wootonii reaches its southern limit in Coahuila and Chihuahua, Mexico; farther south, it is replaced by S. toluccanus de Candolle, a similar, larger, more robust species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 2 (2 in the flora).
The two varieties of Senecio bigelovii are distinguished by morphologic tendencies and by geography.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Herbage glabrous or nearly so (at flowering); blades of proximal leaves often abruptly contracted or at least obtuse at bases; mid and distal leaves clasping; phyllaries mostly 13, 6–8+ mm | var. bigelovii |
1. Herbage often floccose-tomentose, especially among heads and on abaxial faces of leaves; blades of proximal leaves usually tapered to petioles; mid and distal leaves weakly, if at all, clasping; phyllaries mostly 21, (7–)8–12 mm | var. hallii |
SW CO Wildflowers
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USDA Plants Database
