Packera quercetorum
Packera antennariifolia
Oak Creek ragwort
shale barren ragwort
1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils.
1 (sometimes from rosettes, rosettes sometimes clustered), 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.
petiolate;
blades broadly lanceolate to elliptic or spatulate, 20–40+ × 10–20+ mm, bases tapering, margins entire or subentire to dentate distally (faces tomentose).
gradually reduced (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised).
abruptly reduced (petiolate or sessile; narrowly lanceolate to sublyrate, sharply toothed to pinnatisect or entire).
ebracteate, glabrous.
bracteate, densely lanate to sparsely tomentose.
(8–)13;
corolla laminae 6–10+ mm.
8–10(–13);
corolla laminae 5–10 mm.
60–70+;
corolla tubes 2–3 mm, limbs 3.5–4.5 mm.
25–35+;
corolla tubes 3–4 mm, limbs 1.5–2 mm.
(13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy).
13 or 21, green, 5–7 mm, densely tomentose (apices scarious).
inconspicuous.
inconspicuous.
15–40+ in open, cymiform arrays.
6–12+ in corymbiform arrays (lateral cymiform arrays sometimes originating in leaf axils).
1.5–2 mm, glabrous or ± scabrellous;
pappi 5.5–6.5 mm.
1–1.5 mm, hirtellous on ribs;
pappi 4–5 mm.
= 92.
= 46.
Packera quercetorum
Packera antennariifolia
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 antennariifolia is known only from shale barrens or shale-derived soils in central Appalachia. Plants growing on steep slopes have stouter, more horizontal caudices and more extensive fibrous roots than specimens from other locations. Specimens from shale-derived soils, not growing directly on shale barrens, have weakly lobulate leaves and noticeably less hairiness.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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