Packera quercetorum
Packera eurycephala
Oak Creek ragwort
cut-leaf butterweed, wide-head groundsel
1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils.
1 or, usually, multiple, clustered, densely tomentose to 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.
(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 (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised).
gradually reduced (± petiolate, proximal and mid similar to basal, terminal lobes smaller than laterals; distal sessile, incised).
ebracteate, glabrous.
bracteate, sparsely to densely lanate-tomentose.
(8–)13;
corolla laminae 6–10+ mm.
8 or 13;
corolla laminae 10–15 mm.
60–70+;
corolla tubes 2–3 mm, limbs 3.5–4.5 mm.
35–50+;
corolla tubes 3.5–4.5 mm, limbs 2.5–3.5 mm.
(13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy).
13 or 21, green (tips sometimes yellow), 8–10+ mm, densely tomentose proximally, glabrescent distally.
inconspicuous.
inconspicuous (bractlets tomentose).
15–40+ in open, cymiform arrays.
5–20+ in open or compact (rarely), cymiform arrays.
1.5–2 mm, glabrous or ± scabrellous;
pappi 5.5–6.5 mm.
1–1.5 mm, glabrous;
pappi 6–7 mm.
= 92.
= 46.
Packera quercetorum
Packera eurycephala
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.)
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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