Packera flettii |
Packera hesperia |
|
---|---|---|
Flett's groundsel |
serpentine groundsel, Siskiyou butterweed, western ragwort |
|
Habit | Plants perennial, 10–40+ cm; rhizomes horizontal to erect. | Plants perennial, 7–15 cm; caudices fibrous-rooted, relatively slender. |
Stems | 1 or 2–5, loosely clustered, glabrous or leaf axils sparsely pubescent. |
1, glabrous or sparsely tomentose. |
Basal leaves | blades obovate to ovate or sub-lyrate, bases tapering; margins deeply dissected or pinnatifid, crenate to crenate-dentate, petiolate. |
blades ovate, oblanceolate, or spatulate, bases tapering, sometimes obtuse; margins entire, subentire, or dentate, petiolate. |
Cauline leaves | lower similar to basal; middle and upper absent or abruptly reduced distally, sessile. |
lower similar to basal; middle and upper abruptly reduced and bract-like, sessile and clasping. |
Involucres | campanulate to broadly cylindric. |
cylindric; bractlets narrow, red-tinged. |
Ray florets | 5 or 8; rays 5–10 mm. |
(8)13; rays 6–10+ mm; deep yellow. |
Disc florets | 20–30+; corolla tubes 2.5–3.5 mm; limbs 2.5–3.5 mm. |
35–50+; corolla tubes 2.5–3.5 mm; limbs 3–4 mm. |
Phyllaries | (8)13, 4–7 mm, light green; tips yellowish; surfaces glabrous. |
(13)21, green; tips red or dark red; surfaces densely tomentose basally. |
Calyculi | 0 or inconspicuous. |
conspicuous. |
Fruits | 1–1.5 mm, glabrous; pappi 4–4.5 mm. |
1.5–2 mm, glabrous; pappi 5–6 mm. |
Heads | 4–10+; in subumbellate; cyme-like arrays, radiate; peduncles glabrous; bracts absent or inconspicuous. |
1–4+; in corymb-like arrays; peduncles densely lanatetomentose; bracts red-tinged. |
2n | =40. |
=46. |
Packera flettii |
Packera hesperia |
|
Distribution | ||
Discussion | Exposed slopes, rocky or gravelly soils. Flowering Jun–Jul. 300–1100 m. CR. WA. Native. In Oregon, P. flettii is known only from the Coast Range and is rarely collected there. It is also rare in Washington but has a much wider distribution. This species has a unique chromosome number for the genus (2n=40) and is not known to hybridize with other species. |
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 322 Debra Trock |
Flora of Oregon, volume 2, page 323 Debra Trock |
Sibling taxa | ||
Synonyms | Senecio flettii | Senecio hesperius |
Web links |