Oxyria digyna

Plants: (3-)5-50 cm. Stems 1-4(-8), often reddish, simple or branched distally. Leaves: rarely 1-2 on stems, somewhat fleshy; ocrea hyaline or brownish hyaline, 2.5-10 mm, glabrous; petiole 1-15 cm; blade palmately veined with (5-)7(-9) basal veins, 0.5-6.5 × 0.5-6 cm, base cordate, apex rounded. Inflorescences: (1-)2-20 cm; peduncle 1-17 cm. Pedicels: spreading or reflexed, jointed proximal to middle, (1-)3-5 mm. Flowers: 2-6 per ocreate fascicle; perianth 1-2.5 mm; outer 2 tepals spreading in fruit, navicular, 1.2-1.7 × 0.5-1 mm, inner 2 tepals appressed in fruit, broadly elliptic to orbiculate or obovate, 1.4-2.5 × 0.7-1.6 mm; stamens 1.5-2 mm; anthers 0.3-0.8(-1.1) mm; stigmas conspicuously exserted at anthesis, red. Achenes: 3-4.5 × 2.5-5 mm including 2 wings, apex notched; wings reddish or pinkish, veiny. 2n = 14.



Flowering Jun-Sep, fruiting Jul-Oct. Early melting snowbeds and zones of snow accumulation, gravel bars, mudflats, tundra, scree slopes, crevices in rock outcrops, talus slopes; 0-4200 m; Greenland; Alta., B.C., Nfld. and Labr., N.W.T., N.S., Nunavut, Que., Yukon; Alaska, Ariz., Calif., Colo., Idaho, Mont., Nev., N.H., N.Mex., Oreg., S.Dak., Utah, Wash., Wyo.; Europe; Asia.



Morphological and physiological differences between arctic and alpine populations of Oxyria in North America have been documented (H. A. Mooney and W. D. Billings 1961). Arctic plants (Alaska, northern Canada, and Greenland) taken from the field and grown in controlled environments tend to bear inflorescences with more branches, leaves with blades that are wider, and flowers with a more stable number of stamens as compared to alpine plants from populations in the south (California, Colorado, Montana, and Wyoming). Northern plants also have a greater tendency to reproduce asexually, often producing rhizomes and exhibiting relatively lower seed production.

Inuits consume the raw or cooked leaves and stems as a green or mixed with seal blubber or seal oil. Native American tribes in the Rocky Mountains also are reported to use the leaves as a salad (D. E. Moerman 1998). Caribou, muskoxen, and geese are reported to eat the leaves and stems, and arctic hares and lemmings consume the fleshy rhizomes (A. E. Porsild 1957).

General: Perennial, 5-50 cm tall; stems 1-4, erect, slender, simple or branched above, reddish; roots fibrous. Leaves: Basal, rarely cauline, alternate, kidney-shaped to orbicular, 0.5-6.5 cm long, 0.5-6 cm wide, fleshy, palmately veined, glabrous, margins entire or obscurely wavy, base cordate, apex rounded; ocrea membranous, brownish; petiole 1-15 cm long. Flowers: Inflorescence axillary, spike-like; peduncle 0.1-10 cm long, sometimes absent, glabrous or minutely scabrous in lines; pedicels ascending or spreading; flowers 3-6 per fascicle; perianth greenish white, often with a pinkish to purplish base, tepals 5, 3-5 mm long, the outer ones keeled; stamens 8; flowers May-August. Fruits: Achene, 3-4.5 mm long, yellowish to tan, winged, the wings reddish, apex notched. Ecology: Crevices in rock outcrops, talus slopes, alpine and subalpine habitats, seeps, often in areas of snow accumulation; 2900-3700 m (9500-12000 ft); Coconino County (San Francisco Peaks); northeastern and northwestern Canada, northeastern, western, and southw Notes: na Editor: Springer et al. 2008

Stem 1-4 dm; lvs 3-5 cm long and wide, palmately veined; fls 1 mm; fr orbicular, 3-4 mm, turning red; 2n=14. Moist, rocky slopes and ledges; circumboreal, s. in our range to N.S. and n. N.H. Summer.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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