Difference between revisions of "Packera cymbalaria"
Bot. Not. 128: 497. 1976.
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|common_names=Dwarf arctic ragwort | |common_names=Dwarf arctic ragwort | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=F | ||
| + | |label=Illustrated | ||
| + | }}{{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
| + | }} | ||
|basionyms={{Treatment/ID/Basionym | |basionyms={{Treatment/ID/Basionym | ||
|name=Senecio cymbalaria | |name=Senecio cymbalaria | ||
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|publication title=Bot. Not. | |publication title=Bot. Not. | ||
|publication year=1976 | |publication year=1976 | ||
| − | |special status= | + | |special status=Illustrated;Endemic |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V20_1297.xml |
|tribe=Asteraceae tribe Senecioneae | |tribe=Asteraceae tribe Senecioneae | ||
|genus=Packera | |genus=Packera | ||
Latest revision as of 19:59, 5 November 2020
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
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.