Packera bolanderi
Packera tridenticulata
Bolander's groundsel, Bolander's ragwort
threetooth ragwort
1 or 2–3, loosely clustered, glabrous.
1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose.
(and proximal cauline) petiolate;
blades ± orbiculate to oblong, or lyrate (lateral lobes 1–3 pairs, sinuses usually rounded, midribs usually winged), 50–120+ × 30–70+ mm, bases cordate to subcordate, margins shallowly to deeply incised.
(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 and clasping; lanceolate, incised).
gradually reduced (± petiolate or sessile).
ebracteate or inconspicuously bracteate, glabrous.
bracteate, glabrous or sparsely tomentose.
8 or 13;
corolla laminae 10–15+ mm.
8–10(–13);
corolla laminae 5–8+ mm.
30–45+;
corolla tubes 3–4 mm, limbs 3.5–4.5 mm.
45–60+;
corolla tubes 3–3.5 mm, limbs 4–5 mm.
(8), 13, or 21, dark green, 5–8 mm, glabrous or sparsely tomentose proximally.
13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally.
conspicuous.
inconspicuous.
8–15+ in corymbiform or subumbelliform arrays.
4–15+ in corymbiform arrays.
2.5–3.5 mm, glabrous;
pappi 5–7 mm.
1.5–2.5 mm, glabrous or sparsely hirtellous on ribs;
pappi 5–6 mm.
= 46.
= 46.
Packera bolanderi
Packera tridenticulata
Varieties 2 (2 in the flora).
The two varieties of Packera bolanderi have been treated as species. The morphologic characteristics used to distinguish the varieties vary widely within some populations. Presence or absence of multicellular hairs has been used to separate the varieties; that trait is also variable. The morphologic distinction is weak; habitat and elevation records lend support for recognizing two varieties.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
1. Basal leaves (relatively thick and turgid); phyllaries 13 or 21, 6–8+ mm, hairy proximally (hairs tan or brownish, multicelled) | var. bolanderi |
1. Basal leaves (relatively thin); phyllaries 8, 13, (or 21), 5–6 mm, glabrous | var. harfordii |
OR
WA
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
KS Wildflowers
