Packera cynthioides
Packera tampicana
White Mountain ragwort
Great Plains ragwort
1 or 2–3, clustered, densely lanate-tomentose or canescent, tufts of arachnoid tomentum in leaf axils, or glabrescent.
1 or 2–6+, clustered (bases cyanic), glabrous or leaf axils sparsely tomentose.
(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).
(and proximal cauline) petiolate;
blades oblanceolate to spatulate (usually pinnately lobed, lateral lobes 1–6+ pairs, their bases petioluliform, terminal lobes usually larger than laterals, often reniform to ± orbiculate, midribs sometimes ± winged and/or toothed between the primary lobes), 40–120+ × 10–30+ mm, bases ± cuneate, ultimate margins subentire or irregularly crenate, dentate, or lobed.
gradually reduced (sessile; lanceolate to oblanceolate, entire or wavy).
gradually reduced (± petiolate or sessile, clasping; often auriculate, pinnately dissected to pinnately lobed).
0 (or relatively reduced, then densely tomentose).
bracteate, glabrous.
(5–)8;
corolla laminae 8–10+ mm.
8 or 13;
corolla laminae 3–7 mm.
35–45+;
corolla tubes 2.5–3.5 mm, limbs 3.5–4.5 mm.
30–45(–100+);
corolla tubes 1.5–2.5 mm, limbs (1.5–)2.5–3.5 mm.
(8–)13, green (tips red), 3–6 mm, densely tomentose proximally, glabrate distally.
13 or 21, green (tips sometimes reddish), 3–7 mm, glabrous.
inconspicuous (bractlets red-tipped).
inconspicuous or 0.
10–30+ in open or congested, cymiform arrays.
4–25+ in corymbiform arrays.
1–1.5 mm, glabrous;
pappi 5–6 mm.
1–1.5 mm, hirtellous on ribs;
pappi 3–5 mm.
= 46.
= 46.
Packera cynthioides
Packera tampicana
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.)
Packera tampicana is fairly widespread along the Gulf Coastal Plain and north and in Mexico. Morphologically, P. tampicana most closely resembles P. glabella; the former grows in very wet, sandy or clay soils and open sunlight, the latter grows in drier habitats, usually in partial shade.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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