Packera schweinitziana
Packera quercetorum
New England groundsel, Schweinitz's groundsel, Schweinitz's ragwort
Oak Creek ragwort
1, glabrous or leaf axils sparsely tomentose.
1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils.
(and proximal cauline) petiolate;
blades narrowly ovate to oblong-lanceolate, 30–70+ × 10–20+ mm, bases abruptly contracted to subcordate, margins usually serrate-dentate, sometimes subcrenate (apices acute).
(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.
gradually reduced (± sessile; lacerate to subcrenate).
gradually reduced (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised).
bracteate, glabrous.
ebracteate, glabrous.
8–13;
corolla laminae 4–7 mm.
(8–)13;
corolla laminae 6–10+ mm.
50–70+;
corolla tubes 3.5–4 mm, limbs 3–3.5 mm.
60–70+;
corolla tubes 2–3 mm, limbs 3.5–4.5 mm.
13 or 21, light green (tips sometimes black), 5–8 mm, glabrous.
(13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy).
conspicuous.
inconspicuous.
8–20+ in loose, corymbiform arrays.
15–40+ in open, cymiform arrays.
1–1.5 mm, glabrous;
pappi 5–5.5 mm.
1.5–2 mm, glabrous or ± scabrellous;
pappi 5.5–6.5 mm.
= 44.
= 92.
Packera schweinitziana
Packera quercetorum
Packera schweinitziana is rarely mistaken for any other taxon. It grows on slightly acidic soils and may reproduce vegetatively by branched rhizomes. The group of populations on Roan Mountain on the Tennessee-North Carolina border is disjunct from the main distribution.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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