Potentilla hyparctica subsp. elatior

(Abromeit) Elven & D. F. Murray

J. Bot. Res. Inst. Texas 1: 813. 2007.

Common names: Grande potentille subarctique
Basionym: Potentilla emarginata var. elatior Abromeit Biblioth. Bot. 8(heft 42): 8. 1897
Synonyms: P. flabellifolia var. emarginata (Seringe) B. Boivin P. hyparctica var. elatior (Abromeit) Fernald
Treatment appears in FNA Volume 9. Treatment on page 194. Mentioned on page 193.

Plants: hairs usually sparse, sometimes common to abundant. Stems 0.4–2(–2.5) dm. Central leaflets broadly obovate, petiolule (0–)2–3(–5) mm, base broadly cuneate to rounded, teeth broadly oblong, tooth apex obtuse to rounded. Inflorescences 1–3(–5)-flowered. Flowers: epicalyx bractlets broadly oblong or ovate, 2–5 mm wide; sepals: apex obtuse to rounded. 2n = 42.


Phenology: Flowering late spring–summer.
Habitat: Damp ericaceous heath, snow patch meadows, damp arctic and alpine tundra, rocky outcrops, solifluction slopes, talus, mainly acidic bedrock
Elevation: 0–4000 m

Distribution

V9 293-distribution-map.jpg

Greenland, Alta., B.C., Nfld. and Labr. (Labr.), N.W.T., Nunavut, Que., Yukon, Alaska, Mont., Wash., Wyo., Asia (Russian Far East).

Discussion

Geographically isolated and morphologically deviant plants from alpine sites in Montana (Beartooth Mountains), Washington (Mount Baker), and Wyoming (Sublette County) are provisionally assigned to subsp. elatior but likely represent a segregate race. These plants are exceptionally compact and hairy, with leaflets usually lacking petiolules.

Potentilla emarginata Pursh (1813), sometimes used for this taxon, is an illegitimate later homonym of P. emarginata Desfontaines (1804).

Selected References

None.

Lower Taxa

None.
Reidar Elven +, Barbara Ertter +, David F. Murray +  and James L. Reveal +
(Abromeit) Elven & D. F. Murray +
Potentilla emarginata var. elatior +
Grande potentille subarctique +
Greenland +, Alta. +, B.C. +, Nfld. and Labr. (Labr.) +, N.W.T. +, Nunavut +, Que. +, Yukon +, Alaska +, Mont. +, Wash. +, Wyo. +  and Asia (Russian Far East). +
0–4000 m +
Damp ericaceous heath, snow patch meadows, damp arctic and alpine tundra, rocky outcrops, solifluction slopes, talus, mainly acidic bedrock +
Flowering late spring–summer. +
J. Bot. Res. Inst. Texas +
Illustrated +
P. flabellifolia var. emarginata +  and P. hyparctica var. elatior +
Potentilla hyparctica subsp. elatior +
Potentilla hyparctica +
subspecies +