Plants 0.3-6 m. Stems: branches yellow-gray, yellow-brown, or red-brown, not glaucous, glabrous, pilose, or villous; branchlets yellow-brown, gray-brown, or red-brown, (not or weakly glaucous), glabrous, pilose, or moderately densely villous. Leaves: stipules foliaceous, apex acute, acuminate, or rounded; petiole convex to flat, or shallowly grooved adaxially, 3-17 mm, pilose, villous, or pubescent adaxially; largest medial blade (often amphistomatous), lorate, narrowly oblong, or narrowly to broadly elliptic, 26-102 × 8-30 mm, 2.5-3-5.2 times as long as wide, base convex, rounded, or subcordate, margins flat or slightly revolute, (thickened), entire or serrulate, apex acute or acuminate, abaxial surface not glaucous, glabrous, pilose, or moderately densely short-silky, hairs (white, sometimes also ferruginous), wavy, adaxial dull or slightly glossy, glabrous or moderately densely pilose; proximal blade margins entire, crenate, or serrulate; juvenile blade green, pilose to densely villous abaxially, hairs white, sometimes also ferruginous. Catkins flowering as or just before leaves emerge; staminate stout or subglobose, 7-37 × 5-12 mm, flowering branchlet 0.5-5.6 mm; pistillate densely or moderately densely flowered, stout, 12-62 × 7-17 mm, flowering branchlet 1-9 mm; floral bract brown, 0.7-2.1 mm, apex rounded or retuse, abaxially hairy throughout or proximally, hairs straight, wavy, or curly. Staminate flowers: adaxial nectary narrowly oblong, oblong, ovate, or flask-shaped, 0.6-1.5 mm; filaments distinct or connate ca. 1/2 their lengths, glabrous, hairy on proximal 1/2; anthers yellow or purple turning yellow, 0.5-0.8 mm. Pistillate flowers: adaxial nectary oblong, ovate, or flask-shaped, 0.3-0.8 mm, shorter than stipe; stipe 0.5-2.5 mm; ovary pyriform, glabrous, beak gradually to abruptly tapering to or slightly bulged below styles; ovules 10-18 per ovary; styles 0.3-1.4 mm; stigmas flat, abaxially non-papillate with rounded tip, or slenderly cylindrical, or 2 plump lobes, 0.2-0.26-0.48 mm. Capsules 2.5-6 mm. 2n = 76.
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