Senecio spribillei
Senecio eremophilus
cut-leaf groundsel, desert ragwort, dryland ragwort, Elmer's butterweed
glabrous.
glabrous or glabrate.
usually single.
single or loosely clustered.
progressively reduced distally (basal and proximal withering before flowering);
petiolate (petioles purplish, weakly winged, 4–5 cm);
blades broadly triangular-ovate to suborbiculate, 2–4(–5) × 2.5–3 cm, bases truncate to ± cuneate, margins coarsely spinulose-dentate (mid leaves similar, persistent).
± evenly distributed (proximal often withering before flowering);
petiolate or sessile;
blades ovate or lanceolate to narrowly lanceolate, (3–)6–12(–20) × (1–)1.5–5(–7) cm, bases tapered, margins usually pinnate to lacerate, sometimes dentate.
“few”;
corolla laminae ca. 7 mm (inconspicuous, equaling or barely surpassing phyllaries).
± 8;
corolla laminae 5–10 mm.
± 13, 7–9 mm, tips green.
(± 8) ± 13, 3–8+ mm, tips green or black.
of “few,” linear bractlets.
of 3–5+ (prominent or inconspicuous) bractlets (lengths to 3/4 phyllaries).
nodding, 4–6.
10–60+ in compound corymbiform arrays.
glabrous.
usually glabrous, sometimes hirtellous.
= 38, 40, 44.
Senecio spribillei
Senecio eremophilus
Of conservation concern.
Senecio spribillei (from Snowshoe Peak, Cabinet Mountains) is similar in aspect to S. neowebsteri of the Olympic Mountains, Washington.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 3 (3 in the flora).
Varieties of Senecio eremophilus are distinguished by head size and distribution. Varieties eremophilus and macdougalii are notably different; var. kingii is intermediate in both morphology and distribution.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Calyculi: bractlets prominent (lengths of at least some to about 3/4 phyllaries); involucres 7–10 mm diam.; phyllaries 6–8 mm, tips green or weakly, if at all, black | var. eremophilus |
1. Calyculi: bractlets conspicuous or inconspicuous (lengths rarely to 1/2 phyllaries); involucres 5–8 mm diam.; phyllaries 3–6 mm, tips usually black | → 2 |
2. Calyculi: bractlets conspicuous (lengths to 1/2 phyllaries); involucres (5–)6–8 diam.; phyllaries ± 13, (4–)5–6 mm | var. kingii |
2. Calyculi: bractlets inconspicuous; involucres 4–5(–6) mm diam.; phyllaries ± 8 or ± 13, 3–5 mm | var. macdougalii |
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USDA Plants Database
