Branchlets terete, densely ferruginous pilose. Leaves simple; stipules brown, ovate-elliptic, 4-6 × 2-3 mm, membranous, apex obtuse; petiole 3-5.5 cm, densely ferruginous pilose; leaf blade suborbicular or quinquangularly orbicular, 9-11 × 8-10 cm, abaxially with dense rubiginous arachnoid tomentum, adaxially densely pubescent, basal veins 5-7, lateral veins 5 or 6 pairs, veins densely pubescent with spreading hairs, base deeply cordate, notch narrow, 2 sides close together or overlapping, margin 28-47-toothed on each side, teeth fine and sharp, apex acute or rounded, rarely retuse. Panicle loose, ca. 12 cm, basal branches undeveloped; peduncle ca. 2.5 cm, densely ferruginous pilose. Pedicel 1-2 mm, subglabrate. Buds obovoid, 1.5-2 mm, apex rounded. Calyx ca. 0.2 mm, undulate. Filaments filiform, slightly flat, 1-1.2 mm; anthers yellow, ovoid-oblong. Ovary abortive in male flowers. Fl. May.
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