Packera tridenticulata
Packera macounii
threetooth ragwort
long-ray groundsel, Macoun's butterweed, Macoun's groundsel, Puget butterweed, Siskiyou Mountain ragwort, Siskiyou Mountains ragwort
1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose.
1, sparsely to densely tomentose or glabrescent.
(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) petiolate;
blades lanceolate to oblanceolate, 30–50+ × 10–20 mm, bases tapering, margins entire or shallowly toothed (slightly revolute).
gradually reduced (± petiolate or sessile).
gradually reduced (distal sessile, bractlike).
bracteate, glabrous or sparsely tomentose.
inconspicuously bracteate or ebracteate, sparsely tomentose to glabrate.
8–10(–13);
corolla laminae 5–8+ mm.
8(–13);
corolla laminae 8–10+ mm.
45–60+;
corolla tubes 3–3.5 mm, limbs 4–5 mm.
30–40+;
corolla tubes 2.5–3.5 mm, limbs 2–3 mm.
13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally.
13 or 21, green, 5–7+ mm, glabrous.
inconspicuous.
0 or inconspicuous.
4–15+ in corymbiform arrays.
6–15+ in corymbiform arrays.
1.5–2.5 mm, glabrous or sparsely hirtellous on ribs;
pappi 5–6 mm.
1.5–2 mm, glabrous;
pappi 4–5 mm.
= 46.
= 46, 92.
Packera tridenticulata
Packera macounii
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 macounii is similar in overall morphology to P. cana. Leaves of P. macounii are narrower and frequently revolute. It is often cited as being collected on serpentine soils; it is not restricted to them. Senecio fastigiatus Nuttall (1840) is a later homonym of S. fastigiatus Schweinitz ex Elliott (1823), a name of uncertain application.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
KS Wildflowers- Local floras:
BC, 
CA, 
OR, 
WA - Local Web sites: CalFlora, CalPhotos,
Flora NW, 
PNW Herbaria, Turner Photog. 
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USDA Plants Database- LBJ Wildflower Center
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