Packera cynthioides
Packera ogotorukensis
White Mountain ragwort
Ogotoruk Creek butterweed, Ogotoruk Creek ragwort
1 or 2–3, clustered, densely lanate-tomentose or canescent, tufts of arachnoid tomentum in leaf axils, or glabrescent.
1 (often branched proximally, sometimes distally), sparsely to densely floccose-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).
petiolate;
blades elliptic to oblanceolate or ovate, 20–80+ × 20–60+ mm, bases tapering, margins entire, crenate-serrate, or irregularly to pinnately lobed (abaxial faces white-tomentose, adaxials patchy tomentose to glabrate).
gradually reduced (sessile; lanceolate to oblanceolate, entire or wavy).
gradually to abruptly reduced (sessile; mids lanceolate to oblanceolate, irregularly serrate to pinnately lobed, distals bractlike).
0 (or relatively reduced, then densely tomentose).
bracteate, ± tomentose.
(5–)8;
corolla laminae 8–10+ mm.
10–13+;
corolla laminae 8–12+ mm.
35–45+;
corolla tubes 2.5–3.5 mm, limbs 3.5–4.5 mm.
60–70+;
corolla tubes 1–1.5 mm, limbs 2–2.5 mm.
(8–)13, green (tips red), 3–6 mm, densely tomentose proximally, glabrate distally.
13 or 21, green (sometimes with purple streaks, tips usually purple), 4–8 mm, proximally tomentose, rarely glabrous.
inconspicuous (bractlets red-tipped).
conspicuous (bractlets purple-tinged).
10–30+ in open or congested, cymiform arrays.
1(–3).
1–1.5 mm, glabrous;
pappi 5–6 mm.
1–1.5 mm, glabrous;
pappi 2.5–3 mm.
= 46.
= 92.
Packera cynthioides
Packera ogotorukensis
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.)
Plants of Packera ogotorukensis have been treated as a disjunct of P. conterminus (as Senecio conterminus). Gross morphology, cytological data, and pollen morphology all provide good evidence for recognition of P. ogotorukensis as a distinct species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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