Twining shrubs; branchlets densely brown hirsute and glabrate later; winter buds large, ovate, 3-5 × 2.5-3.5 mm, bud scales persistent. Petiole 1.5-3 cm, brown hirsute; leaf blade ovate, broadly obovate, or obovate-elliptic, 7-14 × 4-10 cm, thickly membranous during flowering period, papery to thickly papery during fruiting period, brown hirsute-pubescent, densely so on young leaves and veins, base widely cuneate or approximately orbicular, margin with obtuse teeth, apex widely rounded, mucronate; secondary veins 6-8 pairs, prominent on both surfaces, closely parallel and curved. Cymes axillary or lateral at twig base, 7-14-flowered; rachis 5-10 mm, pubescent; pedicels 2-4 mm, pubescent, jointed near base. Sepals obtusely rounded-triangular, ca. 1.5 mm, margin sparsely ciliate; petals ovate-elliptic, ca. 4 × 2.8 mm, midribs of outer petals papillate. Disk slightly carnose, flat or slightly concave in center, lobes obvious and broad. Male flowers: filament subulate, ca. 3 mm, papillate on lower part; anther broadly ovate; pistillodes undeveloped. Female flowers: pistils 3-5 mm; styles short and thick, columnar; stigma obviously 3-lobed, ca. 1 mm; staminodia small. Capsule globose, 7-8 mm wide. Seeds crescentiform, ca. 5 × 1.5-2 mm. Fl. Mar-May, fr. Aug-Oct.
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