33. Populus ussuriensis Komarov, Bot. Zhurn. S.S.S.R. 19: 510. 1934.
大青杨 da qing yang
Populus maximowiczii A. Henry var. barbinervis Nakai.
Trees to 30 m tall; trunk to 2 m d.b.h.; bark grayish green and ± smooth when young, dull gray and furrowed when old; crown globose. Branchlets grayish green, rarely russet, pubescent when young, angled in cross section. Buds conical, viscid, apex acuminate. Petiole 1-4 cm, densely downy; leaf blade elliptic or broadly elliptic to suborbicular, 5-12 × 3-7(-10) cm, abaxially shiny, adaxially dull green, both surfaces ± downy along veins, base subcordate or rounded, margin crenate, densely ciliate, apex apiculate, twisted. Flowering catkin 12-18 cm; peduncle pubescent; rachis densely pubescent. Capsule ca. 7 mm, glabrous, 3- or 4-valved, subsessile. Fl. Apr-May, fr. May-Jun. 2n = 38*.
Forests; 300-1400 m. E Heilongjiang, E Jilin, E Liaoning [Korea, Russia]
Similar to Populus maximowiczii but branchlets, leaves, and catkin rachis densely pubescent; fallen leaves blackened adaxially. Fallen leaves of both P. maximowiczii and P. koreana become rust colored adaxially.
Used for wood pulp, timber for construction, ship building, and matchwood.