Japan Flora: Tree with pale brown branches puberulous when young; leaves rather thin, obovate to broadly obovate-cuncate, cm. long, 5-7 cm. wide, usually shallowly 3- to 9-Iobed toward the tip, ab-ruptly acuminate, obtuse or cuneately narrowed to an obtuse base, acutely double-toothed, scabrous and short appressed- puberulent above, pilose beneath, with 10 to 17 pairs of lateral nerves; samaras elliptic, glabrous, about 15 nim. long, the seed nearly at the center. May-June. Temperate forests;

Hokkaido, Honshu, Kyushu. Korea, n. China, e. Siberia, and Kamchatka.

Korea Flora: Deciduous tree. Height 20m. Diameter 1m. Winter buds and branchlets elongate-ovoid, apex acute, with 5-6 scales, terminal buds larger than lateral buds (5-8mm long). Branchlets light brown, initially pubescent becoming glabrous. Leaf scars semicircular to triangular. Leaves alternate, broadly spoon-shaped or elliptical, typically with 3 lobes at apex, apex abruptly caudate-acuminate, base asymmetrically cuneate, size 10-20cm × 5-20cm, margin with sharp double serration, upper surface scabrous with short hairs, lower surface light green with fine pubescence. Petiole short, 3-4mm long. Midrib slightly pubescent. Flowers perfect, with 5-6 petals, 5-6 purple-red stamens, and 2 styles. Fruit and seeds samara flat, 15mm long, broadly ovate.

Sporophyte chromosome number: 28.
Flowering period: Mid-April
Fruiting period: Late May-June
Distribution: Northern and northeastern China, southern Far East Russia (including Sakhalin), Japan (Hokkaido-Kyushu); Baekdudaegan (to Gangwon-do), Korea

Ecological characteristics: Grows well in areas with deep soil and high moisture content, particularly in valleys or below mid-mountain slopes. Associates with northern species such as Ulmus davidiana, Kalopanax septemlobus, and Quercus mongolica.

Taxonomic notes: Specimens from Ulleung-do have unlobed leaf tips similar to Ulmus davidiana and are called U. laciniata f. holophylla Nakai, but they are very similar to U. bergmanniana C.K. Schneid. from inland China and require comparative study.