Packera hesperia
Packera bolanderi
serpentine groundsel, Siskiyou butterweed, western ragwort
Bolander's groundsel, Bolander's ragwort
1, glabrous or sparsely tomentose.
1 or 2–3, loosely clustered, glabrous.
(and proximal cauline) petiolate;
blades ovate, oblanceolate, or spatulate, 10–30 × 5–20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate.
(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.
abruptly reduced (sessile, clasping; bractlike, entire).
gradually reduced (petiolate or sessile and clasping; lanceolate, incised).
bracteate (bractlets red-tinged), densely lanate-tomentose.
ebracteate or inconspicuously bracteate, glabrous.
(8–)13;
corolla laminae 6–10+ mm.
8 or 13;
corolla laminae 10–15+ mm.
35–50+;
corolla tubes 2.5–3.5 mm, limbs 3–4 mm.
30–45+;
corolla tubes 3–4 mm, limbs 3.5–4.5 mm.
(13–)21, green (tips red or dark red), densely tomentose proximally.
(8), 13, or 21, dark green, 5–8 mm, glabrous or sparsely tomentose proximally.
conspicuous (bractlets narrow, red-tinged).
conspicuous.
1–4+ in corymbiform arrays.
8–15+ in corymbiform or subumbelliform arrays.
1.5–2 mm, glabrous;
pappi 5–6 mm.
2.5–3.5 mm, glabrous;
pappi 5–7 mm.
= 46.
= 46.
Packera hesperia
Packera bolanderi
Of conservation concern.
Packera hesperia is known only from the Siskiyou Mountains.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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 |
CA
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
WA
