Packera quercetorum
Packera multilobata
Oak Creek ragwort
lobeleaf groundsel
1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils.
1 or 2–5, loosely clustered, usually glabrous or glabrescent, sometimes sparsely tomentose throughout, axils (basal leaves) tomentose.
(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.
(and proximal cauline) petiolate;
blades obovate, oblanceolate, spatulate, or lyrate to sublyrate (± pinnately lobed, lateral lobes 3–6 pairs, smaller than terminal lobes), 40–80+ × 10–30+ mm, bases tapering, ultimate margins incised to dentate.
gradually reduced (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised).
gradually reduced (sessile).
ebracteate, glabrous.
conspicuously bracteate, glabrous or tomentose.
(8–)13;
corolla laminae 6–10+ mm.
8–13;
corolla laminae 7–10 mm.
60–70+;
corolla tubes 2–3 mm, limbs 3.5–4.5 mm.
40–50+;
corolla tubes 4–5 mm, limbs 3–4 mm.
(13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy).
13–21, green (tips often yellow), 4–9+ mm, glabrous or sparsely tomentose (at least proximally).
inconspicuous.
conspicuous.
15–40+ in open, cymiform arrays.
10–30+ in open, corymbiform or subumbelliform arrays.
1.5–2 mm, glabrous or ± scabrellous;
pappi 5.5–6.5 mm.
2–3 mm, glabrous or hirtellous on ribs;
pappi 5–6 mm.
= 92.
= 46, 92.
Packera quercetorum
Packera multilobata
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 multilobata is abundant and widespread west of the Continental Divide. Both morphology and habitat vary. In colder parts of its range, plants are shorter, caudices are better developed with clustered stems, and leaf lobes are larger. In desert-like habitats, basal leaves are narrower and more finely lobed, the tomentum is often persistent, and stems are usually single.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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