Packera tridenticulata
Packera indecora
threetooth ragwort
elegant groundsel, rayless mountain butterweed, rayless mountain groundsel, rayless mountain ragwort
1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose.
1 or 2–3, loosely clustered, glabrous or glabrate.
(and proximal cauline, relatively thick and turgid) petiolate;
blades lanceolate or narrowly oblanceolate, 20–40+ × 5–15 mm, bases tapering, margins usually entire, sometimes sub-pinnatisect (apices subentire or dentate).
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 (± petiolate or sessile).
gradually reduced (petiolate, resembling basals, sublyrate or dissected; distal sessile, subentire to pinnatifid).
bracteate, glabrous or sparsely tomentose.
ebracteate (or bractlets inconspicuous), glabrous or glabrate.
8–10(–13);
corolla laminae 5–8+ mm.
0 or 8–10;
corolla laminae (deep yellow) 3–5 mm.
45–60+;
corolla tubes 3–3.5 mm, limbs 4–5 mm.
60–70+;
corolla tubes 2–3 mm, limbs 2.5–3.5 mm.
13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally.
13 or 21, green (tips sometimes reddish), 7–9 mm, glabrous.
inconspicuous.
conspicuous (bractlets green, tips sometimes reddish).
4–15+ in corymbiform arrays.
8–20+ in subumbelliform arrays.
1.5–2.5 mm, glabrous or sparsely hirtellous on ribs;
pappi 5–6 mm.
1–2 mm, glabrous;
pappi 3–4 mm.
= 46.
= 46, 126, 176, 184.
Packera tridenticulata
Packera indecora
Packera tridenticulata is found throughout the central High Plains, in the foothills of the Rocky Mountains, and in high valleys to the west of the Rocky Mountain front. It tends to grow in clumps; the multiple stems arise from well-developed taproots. It apparently hybridizes with P. neomexicana var. mutabilis where their ranges overlap.
(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.)
KS Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
BC
CA
WA
Flora NW
MI Flora
MN Wildflowers
PNW Herbaria
