Senecio bigelovii
Senecio astephanus
nodding groundsel, nodding ragwort
San Gabriel ragwort
usually floccose-tomentose to glabrescent, sometimes glabrous.
unevenly floccose-lanate or tomentose, glabrescent.
single or loosely clustered.
single.
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).
progressively reduced distally;
petiolate;
blades elliptic-ovate to lanceolate, 10–20(–30?) × 3–7+ cm, bases tapered, margins dentate to denticulate (teeth cartilaginous; mid leaves similar, sessile, smaller; distal leaves bractlike).
0.
0.
± 13 or ± 21, 6–12 mm, tips green.
± 21, 7–8 mm, tips greenish.
of 4–10 linear bractlets (lengths mostly 1/3–1/2 phyllaries, sometimes 1 or 2 equaling phyllaries).
of 5–8+ lance-linear to filiform bractlets (lengths 1/3–7/8 phyllaries).
nodding (especially when young), (1–)3–12(–20) in racemiform or paniculiform arrays (terminal heads often largest).
10–20+ in loose or congested, cymiform arrays.
glabrous.
glabrous.
= 40.
= 40.
Senecio bigelovii
Senecio astephanus
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.)
Of conservation concern.
Senecio astephanus is collected infrequently.
(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 |
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