Packera cynthioides
Packera eurycephala
White Mountain ragwort
cut-leaf butterweed, wide-head groundsel
1 or 2–3, clustered, densely lanate-tomentose or canescent, tufts of arachnoid tomentum in leaf axils, or glabrescent.
1 or, usually, multiple, clustered, densely tomentose to glabrescent.
(thick, leathery) petiolate;
blades narrowly lanceolate or oblanceolate, 25–100+ × 5–20 mm, bases tapering, margins entire, subentire, dentate, or wavy (adaxial faces early glabrescent).
(soon withering), petiolate;
blades lyrate (lateral lobes 2–6+ pairs), ovate, obovate, or spatulate, 70–100+ × 20–30+ mm, bases tapering, ultimate margins irregularly and coarsely serrate-dentate.
gradually reduced (sessile; lanceolate to oblanceolate, entire or wavy).
gradually reduced (± petiolate, proximal and mid similar to basal, terminal lobes smaller than laterals; distal sessile, incised).
0 (or relatively reduced, then densely tomentose).
bracteate, sparsely to densely lanate-tomentose.
(5–)8;
corolla laminae 8–10+ mm.
8 or 13;
corolla laminae 10–15 mm.
35–45+;
corolla tubes 2.5–3.5 mm, limbs 3.5–4.5 mm.
35–50+;
corolla tubes 3.5–4.5 mm, limbs 2.5–3.5 mm.
(8–)13, green (tips red), 3–6 mm, densely tomentose proximally, glabrate distally.
13 or 21, green (tips sometimes yellow), 8–10+ mm, densely tomentose proximally, glabrescent distally.
inconspicuous (bractlets red-tipped).
inconspicuous (bractlets tomentose).
10–30+ in open or congested, cymiform arrays.
5–20+ in open or compact (rarely), cymiform arrays.
1–1.5 mm, glabrous;
pappi 5–6 mm.
1–1.5 mm, glabrous;
pappi 6–7 mm.
= 46.
= 46.
Packera cynthioides
Packera eurycephala
Packera cynthioides blooms later than other Packera species at the same latitudes. It is noted by collectors as usually growing on north- or west-facing slopes in limestone-derived soils. Its cauline leaves are well developed and held at a shallow angle to the stem, giving the plant a more “leafy” aspect than other members of the genus.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Stems (1–)2–6; leaf blades: margins usually serrate-dentate, sometimes deeply dissected, midribs winged | var. eurycephala |
1. Stems 1; leaf blades finely dissected, lateral lobes also dissected, midribs not or weakly winged | var. lewisrosei |
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