Trees to 10(-20) m tall; bark grayish yellow; crown spreading. Sprouts densely gray tomentulose; branchlets gray tomentulose. Leaves of short branchlets with petiole 2-3 cm, slightly compressed; leaf blade reniform, 2-4 × 3-6 cm, both surfaces grayish blue, densely tomentulose, margin entire or apex with 2 or 3 loose teeth. Sprouts with leaf blade elliptic, both surfaces tomentose. Fruiting catkin 5-6 cm; rachis tomentulose. Capsule long ovoid, 5-10 mm, tomentulose, 2-or 3-valved, stipitate. Fl. May, fr. Jul-Aug.
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