Packera cymbalaria

(Pursh) W. A. Weber & Á. Löve

Bot. Not. 128: 497. 1976.

Common names: Dwarf arctic ragwort
IllustratedEndemic
Basionym: Senecio cymbalaria Pursh Fl. Amer. Sept. 2: 530. 1813
Synonyms: Cineraria lyrata Ledebour Packera resedifolia (Lessing) Á. Löve & W. A. Weber S. fernaldii Greenman S. resedifolius Lessing.
Treatment appears in FNA Volume 20. Treatment on page 583. Mentioned on page 571, 582.

Perennials, 6–25+ cm; rhizomatous (mat forming, rhizomes horizontal to suberect, branched). Stems usually 1 (sometimes more, clustered), usually glabrous, sometimes bases and leaf axils tomentose. Basal leaves petiolate; blades ovate to obovate, lyrate, or reniform, 10–30+ × 10–25+ mm, bases cuneate (sometimes tapering to winged petioles) to subcordate or contracted, margins crenate, dentate, or weakly lobed. Cauline leaves abruptly reduced (sessile, not clasping; lanceolate, entire or pinnately lobed to pinnatisect). Heads 1–2. Peduncles 0 or relatively reduced (then densely tomentose). Calyculi conspicuous (bractlets cyanic). Phyllaries 21, deep red or green (tips red), 6–8 mm, glabrous. Ray florets 0 or 11–13; corolla laminae (yellow, purple streaks in veins) 10–14+ mm. Disc florets 60–75+; corolla tubes 2–2.5 mm, limbs 4–5 mm. Cypselae 1.5–2 mm, glabrous; pappi 5–6 mm. 2n = 46, 92, 138.


Phenology: Flowering mid Jun–early Aug.
Habitat: Exposed rocky slopes, tundra turf
Elevation: 0–1900 m

Distribution

V20-1297-distribution-map.gif

Alta., B.C., Nfld. and Labr. (Nfld.), N.W.T., Que., Yukon, Alaska.

Discussion

Packera cymbalaria occurs in three, disjunct regions: western Alaska eastward into western N.W.T. and south into northwestern British Columbia; Newfoundland and the Gaspé Peninsula, Quebec; and Siberia. Considerable morphologic overlap exists between western and eastern populations in North America; western populations have slightly different flavonoid chemistries and chromosome numbers. Western populations are either diploid or tetraploid; eastern populations are hexaploid. The correct name for this species may prove to be Packera heterophylla (Fischer) E. Wiebe, based on Cineraria heterophylla Fischer.

Selected References

None.

Lower Taxa

None.
... more about "Packera cymbalaria"
Debra K. Trock +
(Pursh) W. A. Weber & Á. Löve +
Senecio cymbalaria +
Dwarf arctic ragwort +
Alta. +, B.C. +, Nfld. and Labr. (Nfld.) +, N.W.T. +, Que. +, Yukon +  and Alaska. +
0–1900 m +
Exposed rocky slopes, tundra turf +
Flowering mid Jun–early Aug. +
Illustrated +  and Endemic +
Cineraria lyrata +, Packera resedifolia +, S. fernaldii +  and S. resedifolius +
Packera cymbalaria +
species +