Trautvetter, Nouv. Mém. Soc. Imp. Naturalistes Moscou. 2: 306, plate 13. 1832.
Arctic seashore or oval-leaf willow
0.02-0.05 m, not clonal or forming clones by layering.
trailing; branches yellow-brown, gray-brown, or red-brown, glabrous or hairy; branchlets yellow-green, yellow-brown, or red-brown, glabrous or pilose.
stipules usually absent or rudimentary, rarely foliaceous; petiole (deeply to shallowly grooved adaxially), 1.1-16 mm, (glabrous); largest medial blade hypostomatous, narrowly to broadly elliptic, circular, subcircular, or obovate, 13-46 × 7-20 mm, 1-3.4 times as long as wide, base subcordate, cordate, rounded, or convex, margins slightly revolute or flat, entire, sometimes ciliate, apex convex, rounded, acuminate, acute, or retuse, abaxial surface glabrous, villous, long-silky, pubescent, or pilose, hairs wavy or straight, adaxial highly glossy, usually glabrous; proximal blade margins entire; juvenile blade (reddish or yellowish green), pilose, villous, or long-silky abaxially.
staminate 4.8-46 × 5-11 mm, flowering branchlet 1.5-24 mm; pistillate moderately densely flowered, stout, subglobose, globose, or slender, 6.3-50 × 5-28 mm, flowering branchlet 2.5-22 mm; floral bract brown, greenish, or bicolor, 1.2-2 mm, apex rounded, entire or, sometimes, 2-fid, abaxially hairy, hairs straight or wavy.
abaxial nectary 0.6-1 mm, adaxial nectary oblong or ovate, 0.6-1.6 mm, nectaries distinct or connate and cup-shaped; filaments distinct or connate less than 1/2 their lengths (glabrous); anthers elliptic, short-cylindrical, or globose, 0.3-0.5(-0.6) mm.
abaxial nectary (0-)0.4-0.6 mm, adaxial nectary longer than stipe; stipe 0.2-1.4 mm; ovary obclavate or pyriform, glaucous or not, usually glabrous or tomentose, sometimes pubescent or villous, beak abruptly tapering to styles; ovules 10-15 per ovary; styles 0.2-0.8 mm; stigmas flat, abaxially non-papillate with pointed tip, or slenderly cylindrical, 0.32-0.41-0.64 mm.
Varieties 4 (4 in the flora): n, nw North America, Asia.