Packera schweinitziana
Packera cana
New England groundsel, Schweinitz's groundsel, Schweinitz's ragwort
woolly butterweed, woolly groundsel
1, glabrous or leaf axils sparsely tomentose.
1 (per rosette, rosettes clustered), densely lanate or canescent.
(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 ovate or elliptic to lanceolate, 25–50+ × 10–30 mm, bases tapering, margins entire or irregularly undulate to weakly dentate (abaxial faces persistently lanate, adaxial lanate to subglabrescent).
gradually reduced (± sessile; lacerate to subcrenate).
gradually reduced (petiolate or sessile, then weakly clasping; elliptic to lanceolate, entire or weakly dentate).
bracteate, glabrous.
bracteate, usually densely lanate to floccose-tomentose (sometimes subglabrescent).
8–13;
corolla laminae 4–7 mm.
8–10 (or 13);
corolla laminae 8–10+ mm.
50–70+;
corolla tubes 3.5–4 mm, limbs 3–3.5 mm.
35–50+;
corolla tubes 2.5–3.5 mm, limbs 3.5–4.5 mm.
13 or 21, light green (tips sometimes black), 5–8 mm, glabrous.
13 or 21, green, 5–8+ mm, densely tomentose.
conspicuous.
inconspicuous (bractlets tomentose).
8–20+ in loose, corymbiform arrays.
8–15+ in corymbiform arrays.
1–1.5 mm, glabrous;
pappi 5–5.5 mm.
2.5–3.5+ mm, glabrous;
pappi 4.5–7 mm.
= 44.
= 46, 92.
Packera schweinitziana
Packera cana
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 cana is found in a wide variety of habitats and in a wide range of elevations throughout the western Cordillera and into the High Plains. Morphology is relatively uniform throughout its range except that alpine specimens are notably dwarfed and are often mistaken for P. werneriifolia, which differs by its consistently scapiform habit.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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