Packera tridenticulata
Packera tampicana
threetooth ragwort
Great Plains ragwort
1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose.
1 or 2–6+, clustered (bases cyanic), glabrous or leaf axils sparsely 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 oblanceolate to spatulate (usually pinnately lobed, lateral lobes 1–6+ pairs, their bases petioluliform, terminal lobes usually larger than laterals, often reniform to ± orbiculate, midribs sometimes ± winged and/or toothed between the primary lobes), 40–120+ × 10–30+ mm, bases ± cuneate, ultimate margins subentire or irregularly crenate, dentate, or lobed.
gradually reduced (± petiolate or sessile).
gradually reduced (± petiolate or sessile, clasping; often auriculate, pinnately dissected to pinnately lobed).
bracteate, glabrous or sparsely tomentose.
bracteate, glabrous.
8–10(–13);
corolla laminae 5–8+ mm.
8 or 13;
corolla laminae 3–7 mm.
45–60+;
corolla tubes 3–3.5 mm, limbs 4–5 mm.
30–45(–100+);
corolla tubes 1.5–2.5 mm, limbs (1.5–)2.5–3.5 mm.
13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally.
13 or 21, green (tips sometimes reddish), 3–7 mm, glabrous.
inconspicuous.
inconspicuous or 0.
4–15+ in corymbiform arrays.
4–25+ in corymbiform arrays.
1.5–2.5 mm, glabrous or sparsely hirtellous on ribs;
pappi 5–6 mm.
1–1.5 mm, hirtellous on ribs;
pappi 3–5 mm.
= 46.
= 46.
Packera tridenticulata
Packera tampicana
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 tampicana is fairly widespread along the Gulf Coastal Plain and north and in Mexico. Morphologically, P. tampicana most closely resembles P. glabella; the former grows in very wet, sandy or clay soils and open sunlight, the latter grows in drier habitats, usually in partial shade.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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