Korea Flora: Trees up to 20 m tall; bark grayish brown, smooth when young, vertically fissured at maturity; twigs reddish brown, thick. Buds ovoid, red, not sticky to very sticky, glabrous to pilose at tip with yellowish brown hairs but otherwise glabrous, to 2 cm long. Leaves (17--)23--27(--31) cm with 6--8(--9) pairs of leaflets; petiole (30--)39--47(--53) mm; stipules caducous. Leaflets to (6.2--)7.4--8.2(--9.6) cm long, (1.5--)2.0--2.3(--2.6) cm wide, acuminate with acute apex, margin finely toothed almost to base, upper surface dark green, lower surface pale green and glabrous; lateral veins 15--21 on each side of midvein. Inflorescence to (8.0--)9.8--10.6(--14.4) cm long, (9.0--)13.0--16.0(--23.5) cm wide, corymbose. Flowers to (1.0--)1.2--1.4 (1.6) cm diam, crowded, fragrant. Sepals triangular, green. Petals 5--6 mm long, 4--5 mm wide, broadly elliptic, white. Fruits glossy, yellowish-orange or orange to red, subglobose to globose, (7.5--)9.0--10.5(--12.0) mm long, (8.0--)9.2--10.6(--13.0) mm wide. Calyx somewhat fleshy. Carpels 3--5(--6), semi-inferior, white hairy. Styles (3--)4--5(--6), to 3 mm, distantly inserted. Stamen 20, 4 mm long; anthers yellow. Seeds light brown to brown, to 4.1 xxx 2.1 mm, up to 12 per fruit. A sexual diploid (2n = 34) species.

Flowering: June-August.
Fruiting: Late September to mid-October.
This plant is a special endemic species found only on Ulleungdo Island , highlighting its unique ecological and geographical significance.