Pleiarina humaensis (Y. L. Chou & R. C. Chou) N. Chao & G. T. Gong.

Shrubs; bark brownish gray. One-year-old branchlets grayish green or olive green, glabrous, shiny; juvenile branchlets brown. Buds yellowish brown, long ellipsoid-ovoid. Stipules absent; petiole 4-5 mm, glabrous; leaf blade obovate-oblong, or long elliptic, broadest above middle, 3-8 × 1-2.5(-3) cm, glabrous, abaxially greenish, adaxially green, shiny, base cuneate, rarely subrounded, margin glandular serrate, apex shortly acuminate or acute. Male catkin unknown. Female catkin 1.5-3.5 cm, pedunculate; rachis with dense, long, white hairs; bracts brownish, long elliptic, 2-2.5 mm, membranous, abaxially long pubescent proximally, adaxially villous, apex obtuse. Female flower: adaxial gland forked, longer than stipe, rarely entire; ovary ovoid-conical, 4-5 mm, very shortly stipitate, sparsely long pubescent distally; style short, forked; stigma 2-lobed. Capsule yellowish brown, 6-7 mm, rarely glabrescent. Fl. Jun, fr. Jul-Aug.

* Stream and river margins; 300-400 m. N Heilongjiang