Packera tridenticulata
Packera multilobata
threetooth ragwort
lobeleaf groundsel
1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose.
1 or 2–5, loosely clustered, usually glabrous or glabrescent, sometimes sparsely tomentose throughout, axils (basal leaves) 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).
(and proximal cauline) petiolate;
blades obovate, oblanceolate, spatulate, or lyrate to sublyrate (± pinnately lobed, lateral lobes 3–6 pairs, smaller than terminal lobes), 40–80+ × 10–30+ mm, bases tapering, ultimate margins incised to dentate.
gradually reduced (± petiolate or sessile).
gradually reduced (sessile).
bracteate, glabrous or sparsely tomentose.
conspicuously bracteate, glabrous or tomentose.
8–10(–13);
corolla laminae 5–8+ mm.
8–13;
corolla laminae 7–10 mm.
45–60+;
corolla tubes 3–3.5 mm, limbs 4–5 mm.
40–50+;
corolla tubes 4–5 mm, limbs 3–4 mm.
13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally.
13–21, green (tips often yellow), 4–9+ mm, glabrous or sparsely tomentose (at least proximally).
inconspicuous.
conspicuous.
4–15+ in corymbiform arrays.
10–30+ in open, corymbiform or subumbelliform arrays.
1.5–2.5 mm, glabrous or sparsely hirtellous on ribs;
pappi 5–6 mm.
2–3 mm, glabrous or hirtellous on ribs;
pappi 5–6 mm.
= 46.
= 46, 92.
Packera tridenticulata
Packera multilobata
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 multilobata is abundant and widespread west of the Continental Divide. Both morphology and habitat vary. In colder parts of its range, plants are shorter, caudices are better developed with clustered stems, and leaf lobes are larger. In desert-like habitats, basal leaves are narrower and more finely lobed, the tomentum is often persistent, and stems are usually single.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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