Cupressaceae Calocedrus rupestris Aver., H.T. Nguyen & L.K. Phan Ha Giang Prov., Quan Ba Distr., Can Ty Comm., Bat Dai Son NR, ca. 1200-1400 m, about 1 km to W of Dau Cau Vill., around point 23005′06” N, 105001′56” E, ridges of limestone mountains.
In small groups in primary closed evergreen conifer submontane forests with the co-dominance of Xanthocyparis vietnamensis.
Trees up to 12-15 m, 0.4-0.5 m d.b.h.; seed cones nearly ripe or ripe, opened.