Packera tridenticulata
Packera sanguisorboides
threetooth ragwort
burnet ragwort
1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose.
1 or 2–3, clustered, glabrous or leaf axils 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 broadly oblanceolate (pinnately lobed, lateral lobes 2–3+ pairs, their bases petioluliform, terminal lobes larger than laterals, ovate to reniform, midribs not winged), 60–120+ × 20–60 mm, bases contracted, ultimate margins crenate to crenate-dentate.
gradually reduced (± petiolate or sessile).
gradually reduced (petiolate or sessile; lyrate to sublyrate, midribs winged, terminal lobes weakly distinct, shallowly dentate).
bracteate, glabrous or sparsely tomentose.
inconspicuously bracteate, glabrous or tomentose proximally.
8–10(–13);
corolla laminae 5–8+ mm.
8;
corolla laminae 6–12 mm.
45–60+;
corolla tubes 3–3.5 mm, limbs 4–5 mm.
35–50+;
corolla tubes 2.5–3.5 mm, limbs 2–3 mm.
13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally.
13, bright green (tips light green to yellow), 4–7 mm, glabrous.
inconspicuous.
inconspicuous.
4–15+ in corymbiform arrays.
3–8+ in subumbelliform or compound, cymiform arrays (of 2–4+ cymiform clusters of 2–5+ heads each).
1.5–2.5 mm, glabrous or sparsely hirtellous on ribs;
pappi 5–6 mm.
1.5–2 mm, glabrous;
pappi 4.5–5.5 mm.
= 46.
= 46.
Packera tridenticulata
Packera sanguisorboides
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 sanguisorboides is known from the San Juan and Sangre de Cristo mountains of northern New Mexico, the Magdalena Mountains of western New Mexico, and the Sacramento Mountains of southern Lincoln and Otero counties. It may have affinities with P. coahuilensis Greenman.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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