Packera glabella
Packera cana
butterweed
woolly butterweed, woolly groundsel
1 (striated, frequently hollow, often pink- to purple-tinged), glabrous or leaf axils sparsely tomentose.
1 (per rosette, rosettes clustered), densely lanate or canescent.
(and proximal cauline) obscurely petiolate;
blades obovate to oblanceolate, sometimes lyrate (lateral lobes to 5 pairs, terminal lobes larger than laterals), 50–150+ × 10–30+ mm, bases tapering, ultimate margins crenate to irregularly undulate.
(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 (weakly clasping, similar to basal).
gradually reduced (petiolate or sessile, then weakly clasping; elliptic to lanceolate, entire or weakly dentate).
bracteate, glabrous or bases tomentose.
bracteate, usually densely lanate to floccose-tomentose (sometimes subglabrescent).
(8–)13;
corolla laminae 7–9 mm.
8–10 (or 13);
corolla laminae 8–10+ mm.
35–50+;
corolla tubes 2.5–3.5 mm, limbs 2–3 mm.
35–50+;
corolla tubes 2.5–3.5 mm, limbs 3.5–4.5 mm.
(13–)21, green, 5–7 mm, glabrous.
13 or 21, green, 5–8+ mm, densely tomentose.
conspicuous (bractlets 2.5–4 mm).
inconspicuous (bractlets tomentose).
8–30+ in umbelliform or cymiform arrays (robust plants with multiple arrays).
8–15+ in corymbiform arrays.
1–1.5 mm, sparsely hirtellous on ribs or glabrous;
pappi 3–4 mm.
2.5–3.5+ mm, glabrous;
pappi 4.5–7 mm.
= 46.
= 46, 92.
Packera glabella
Packera cana
Packera glabella is common and almost weedy in wet, partially shaded places. The hollow, striated stems of P. glabella are distinctive.
(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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