Packera quercetorum
Packera tridenticulata
Oak Creek ragwort
threetooth ragwort
1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils.
1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes 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, relatively thick and turgid) petiolate;
blades lanceolate or narrowly oblanceolate, 20–40+ × 5–15 mm, bases tapering, margins usually entire, sometimes sub-pinnatisect (apices subentire or dentate).
gradually reduced (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised).
gradually reduced (± petiolate or sessile).
ebracteate, glabrous.
bracteate, glabrous or sparsely tomentose.
(8–)13;
corolla laminae 6–10+ mm.
8–10(–13);
corolla laminae 5–8+ mm.
60–70+;
corolla tubes 2–3 mm, limbs 3.5–4.5 mm.
45–60+;
corolla tubes 3–3.5 mm, limbs 4–5 mm.
(13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy).
13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally.
inconspicuous.
inconspicuous.
15–40+ in open, cymiform arrays.
4–15+ in corymbiform arrays.
1.5–2 mm, glabrous or ± scabrellous;
pappi 5.5–6.5 mm.
1.5–2.5 mm, glabrous or sparsely hirtellous on ribs;
pappi 5–6 mm.
= 92.
= 46.
Packera quercetorum
Packera tridenticulata
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 tridenticulata is found throughout the central High Plains, in the foothills of the Rocky Mountains, and in high valleys to the west of the Rocky Mountain front. It tends to grow in clumps; the multiple stems arise from well-developed taproots. It apparently hybridizes with P. neomexicana var. mutabilis where their ranges overlap.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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