Shrubs or trees, 1-5(-17) m. Stems: branches gray-brown or red-brown, glabrous or hairy; branchlets yellow-brown or red-brown, pubescent or densely long-silky-villous, hairs spreading, appressed. Leaves: stipules rudimentary on early ones, foliaceous or rudimentary on late ones; petiole puberulent, villous, or short-silky adaxially; largest medial blade (sometimes hypostomatous) linear, 39-96 × 5.3-14 mm, 6.5-31 times as long as wide, abaxial surface glabrous or densely silky-villous to glabrescent, hairs appressed or spreading, straight, adaxial sparsely to very densely long-silky-villous; juvenile blade densely silky-villous abaxially (hairs relatively long, spreading, appressed). Catkins: staminate 7-42 × 4-9 mm, flowering branchlet 2-56 mm; pistillate densely or moderately densely flowered, slender to stout, 22-43 × 3-11 mm, flowering branchlet 2-55 mm; floral bract 1.4-2.6 mm, apex acute or convex, entire or erose, abaxially hairy throughout or proximally, hairs wavy, straight, or crinkled. Staminate flowers: abaxial nectary 0.5-0.9 mm, adaxial nectary narrowly oblong, square, or ovate, 0.4-1.1 mm; anthers 0.6-1.1 mm. Pistillate flowers: adaxial nectary oblong, ovate, or flask-shaped, 0.4-1.3 mm, longer than stipe; stipe 0-0.2 mm; ovary pyriform, pilose or villous to glabrescent, beak abruptly tapering to styles; ovules 12-24 per ovary; styles (± distinct) 0.2-0.5 mm; stigmas flat, abaxially non-papillate with pointed tip, or slenderly cylindrical, 0.3-1 mm.
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