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FNA | Family List | FNA Vol. 9 | Rosaceae | Dryas

7a. Dryas integrifolia Vahl subsp. integrifolia

Dryas chamissonis Sprengel ex Juzepczuk; D. integrifolia var. canescens Simmons; D. integrifolia subsp. chamissonis (Sprengel ex Juzepczuk) Scoggan; D. integrifolia var. subintegrifolia Hultén

Leaf blades linear to narrowly ovate, base cordate to truncate, margins usually strongly revolute, entire or crenate to serrate or dentate in proximal 2/3–3/4, apex acute. 2n = 18.

Flowering Jun–Aug. Tundra, heathlands, rocky mountain slopes, grasslands, sandy ridges and beaches, mesic and dry areas, solifluction soil; 0–2600 m; Greenland; Alta., B.C., Man., Nfld. and Labr., N.W.T., Nunavut, Ont., Que., Yukon; Alaska; e Asia (Russian Far East).

In some states and provinces, subsp. integrifolia has a limited distribution: central and northeastern Manitoba, northern Lake Superior and the Hudson Bay region of Ontario, and southeastern and northern Quebec.

In Greenland, subsp. integrifolia has widely introgressed with Dryas octopetala.

Dryas ×lewinii Rouleau (D. ×wyssiana Beauverd, name invalid) of Newfoundland is a putative hybrid between subsp. integrifolia and D. drummondii.


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