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FOC | Family List | FOC Vol. 4 | Cupressaceae | Thuja

2. Thuja koraiensis Nakai, Bot. Mag. (Tokyo). 33: 196. 1919.

朝鲜崖柏 chao xian ya bai

Shrubs (when on mountain ridges), or small trees to 10 m tall; trunk to 80 cm d.b.h.; bark reddish brown and smooth when young, grayish brown and fissured when old, soon flaking; branches ascending or spreading; young branchlets ± glaucous, soon becoming green. Facial leaves 1-2 mm, to 15 mm on leading branchlets, abaxial gland near base, apex obtuse; lateral leaves as long as or shorter than facial leaves, apex incurved. Pollen cones purplish, subglobose, 2-3 mm; microsporophylls 6-10, each with 3 or 4 pollen sacs. Seed cones dark brown when ripe, ellipsoid-globose, 7-10 × 6-8 mm; basal pair of cone scales subellipsoid, middle pairs suboblong, apical pair long and narrow. Seeds ellipsoid, flattened, ca. 4 × 1.5 mm; wings 1-1.5 mm wide. Pollination May, seed maturity Sep.

Valleys, slopes, mountain ridges; 700-1800 m. S Jilin (Changbai Shan) [Korea]

A vulnerable species in China.


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