Packera glabella
Packera indecora
butterweed
elegant groundsel, rayless mountain butterweed, rayless mountain groundsel, rayless mountain ragwort
1 (striated, frequently hollow, often pink- to purple-tinged), glabrous or leaf axils sparsely tomentose.
1 or 2–3, loosely clustered, glabrous or glabrate.
(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.
petiolate;
blades elliptic-ovate, oblong, or subreniform, 20–50 × 10–40+ mm, bases subcordate, truncate, or cuneate, margins usually crenate-dentate to coarsely dentate-lacerate, seldom subentire.
gradually reduced (weakly clasping, similar to basal).
gradually reduced (petiolate, resembling basals, sublyrate or dissected; distal sessile, subentire to pinnatifid).
bracteate, glabrous or bases tomentose.
ebracteate (or bractlets inconspicuous), glabrous or glabrate.
(8–)13;
corolla laminae 7–9 mm.
0 or 8–10;
corolla laminae (deep yellow) 3–5 mm.
35–50+;
corolla tubes 2.5–3.5 mm, limbs 2–3 mm.
60–70+;
corolla tubes 2–3 mm, limbs 2.5–3.5 mm.
(13–)21, green, 5–7 mm, glabrous.
13 or 21, green (tips sometimes reddish), 7–9 mm, glabrous.
conspicuous (bractlets 2.5–4 mm).
conspicuous (bractlets green, tips sometimes reddish).
8–30+ in umbelliform or cymiform arrays (robust plants with multiple arrays).
8–20+ in subumbelliform arrays.
1–1.5 mm, sparsely hirtellous on ribs or glabrous;
pappi 3–4 mm.
1–2 mm, glabrous;
pappi 3–4 mm.
= 46.
= 46, 126, 176, 184.
Packera glabella
Packera indecora
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 indecora is found at relatively low elevations in eastern Canada and at middle to subalpine elevations in the western cordillera. It closely resembles P. pauciflora and it is often difficult to identify specimens in the herbarium. Biosystematic studies (J. F. Bain and J. Whitton 1994) have indicated that although they are morphologically similar, P. indecora and P. pauciflora have distinctly different physiologies and should be maintained as distinct taxa.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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