Packera quercetorum
Packera cynthioides
Oak Creek ragwort
White Mountain ragwort
1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils.
1 or 2–3, clustered, densely lanate-tomentose or canescent, tufts of arachnoid tomentum in leaf axils, or glabrescent.
(and proximal cauline) petiolate;
blades obovate or lyrate (pinnately lobed, lateral lobes 2–6+ pairs, their bases petioluliform, terminal lobes larger than laterals, midribs narrowly winged), 60–160+ × 20–40+ mm, bases wide, ultimate margins sharply dentate, crenate-dentate, or irregularly incised.
(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).
gradually reduced (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised).
gradually reduced (sessile; lanceolate to oblanceolate, entire or wavy).
ebracteate, glabrous.
0 (or relatively reduced, then densely tomentose).
(8–)13;
corolla laminae 6–10+ mm.
(5–)8;
corolla laminae 8–10+ mm.
60–70+;
corolla tubes 2–3 mm, limbs 3.5–4.5 mm.
35–45+;
corolla tubes 2.5–3.5 mm, limbs 3.5–4.5 mm.
(13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy).
(8–)13, green (tips red), 3–6 mm, densely tomentose proximally, glabrate distally.
inconspicuous.
inconspicuous (bractlets red-tipped).
15–40+ in open, cymiform arrays.
10–30+ in open or congested, cymiform arrays.
1.5–2 mm, glabrous or ± scabrellous;
pappi 5.5–6.5 mm.
1–1.5 mm, glabrous;
pappi 5–6 mm.
= 92.
= 46.
Packera quercetorum
Packera cynthioides
Packera quercetorum is found only infrequently and in relatively small populations in central and southern Arizona and west-central New Mexico. The plants are robust and have probable affinities to P. multilobata. The plants have a bluish tinge when freshly collected and are distinctive in the field.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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