Packera schweinitziana
Packera antennariifolia
New England groundsel, Schweinitz's groundsel, Schweinitz's ragwort
shale barren ragwort
1, glabrous or leaf axils sparsely tomentose.
1 (sometimes from rosettes, rosettes sometimes clustered), tomentose.
(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).
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 (± sessile; lacerate to subcrenate).
abruptly reduced (petiolate or sessile; narrowly lanceolate to sublyrate, sharply toothed to pinnatisect or entire).
bracteate, glabrous.
bracteate, densely lanate to sparsely tomentose.
8–13;
corolla laminae 4–7 mm.
8–10(–13);
corolla laminae 5–10 mm.
50–70+;
corolla tubes 3.5–4 mm, limbs 3–3.5 mm.
25–35+;
corolla tubes 3–4 mm, limbs 1.5–2 mm.
13 or 21, light green (tips sometimes black), 5–8 mm, glabrous.
13 or 21, green, 5–7 mm, densely tomentose (apices scarious).
conspicuous.
inconspicuous.
8–20+ in loose, corymbiform arrays.
6–12+ in corymbiform arrays (lateral cymiform arrays sometimes originating in leaf axils).
1–1.5 mm, glabrous;
pappi 5–5.5 mm.
1–1.5 mm, hirtellous on ribs;
pappi 4–5 mm.
= 44.
= 46.
Packera schweinitziana
Packera antennariifolia
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 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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