Packera tridenticulata
threetooth ragwort
1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose.
(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).
gradually reduced (± petiolate or sessile).
bracteate, glabrous or sparsely tomentose.
8–10(–13);
corolla laminae 5–8+ mm.
45–60+;
corolla tubes 3–3.5 mm, limbs 4–5 mm.
13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally.
inconspicuous.
4–15+ in corymbiform arrays.
1.5–2.5 mm, glabrous or sparsely hirtellous on ribs;
pappi 5–6 mm.
= 46.
Packera tridenticulata
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.)
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