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serpentine groundsel, Siskiyou butterweed, western ragwort

Habit Plants perennial, 7–15 cm; caudices fibrous-rooted, relatively slender.
Stems

1, glabrous or sparsely tomentose.

Basal leaves

blades ovate, oblanceolate, or spatulate, bases tapering, sometimes obtuse;

margins entire, subentire, or dentate, petiolate.

Cauline leaves

lower similar to basal; middle and upper abruptly reduced and bract-like, sessile and clasping.

Involucres

cylindric;

bractlets narrow, red-tinged.

Ray florets

(8)13;

rays 6–10+ mm; deep yellow.

Disc florets

35–50+;

corolla tubes 2.5–3.5 mm;

limbs 3–4 mm.

Phyllaries

(13)21, green;

tips red or dark red;

surfaces densely tomentose basally.

Calyculi

conspicuous.

Fruits

1.5–2 mm, glabrous;

pappi 5–6 mm.

Heads

1–4+; in corymb-like arrays;

peduncles densely lanatetomentose;

bracts red-tinged.

2n

=46.

Packera hesperia

Packera millefolium

Distribution
[WildflowerSearch map]
[BONAP county map]
[BONAP county map]
Discussion

Serpentine, open woodlands. Flowering Apr–Jun. 300–1400 m. Sisk. CA. Native.

Until collections of this species were made in Del Norte County in California, Packera hesperia was known only from two counties in southern Oregon. It has since been listed as a species of conservation concern in California.

Source Flora of Oregon, volume 2, page 323
Debra Trock
Sibling taxa
P. bolanderi, P. cana, P. eurycephala, P. flettii, P. macounii, P. porteri, P. pseudaurea, P. streptanthifolia, P. subnuda
P. bolanderi, P. cana, P. eurycephala, P. flettii, P. hesperia, P. macounii, P. porteri, P. pseudaurea, P. streptanthifolia, P. subnuda
Synonyms Senecio hesperius
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