Packera glabella |
Packera hesperia |
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serpentine groundsel, Siskiyou butterweed, western ragwort |
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Habit | Plants perennial, 7–15 cm; caudices fibrous-rooted, relatively slender. | |
Stems | 1, glabrous or sparsely tomentose. |
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Basal leaves | blades ovate, oblanceolate, or spatulate, bases tapering, sometimes obtuse; margins entire, subentire, or dentate, petiolate. |
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Cauline leaves | lower similar to basal; middle and upper abruptly reduced and bract-like, sessile and clasping. |
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Involucres | cylindric; bractlets narrow, red-tinged. |
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Ray florets | (8)13; rays 6–10+ mm; deep yellow. |
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Disc florets | 35–50+; corolla tubes 2.5–3.5 mm; limbs 3–4 mm. |
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Phyllaries | (13)21, green; tips red or dark red; surfaces densely tomentose basally. |
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Calyculi | conspicuous. |
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Fruits | 1.5–2 mm, glabrous; pappi 5–6 mm. |
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Heads | 1–4+; in corymb-like arrays; peduncles densely lanatetomentose; bracts red-tinged. |
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2n | =46. |
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Packera glabella |
Packera hesperia |
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Distribution | ||
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. |
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Source | Flora of Oregon, volume 2, page 323 Debra Trock |
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Sibling taxa | ||
Synonyms | Senecio hesperius | |
Web links |