碟斗青冈 die dou qing gang

Quercus disciformis Chun & Tsiang, J. Arnold Arbor. 28: 324. 1947; Q. shingjenensis Y. T. Chang.

Trees 10-14 m tall. Branchlet tawny velutinous, glabrescent. Petiole ca. 2 cm, tawny tomentose when young, glabrescent; leaf blade oblong to obovate-elliptic, 6-13 × 2.5-4 cm, subleathery, glabrescent, base broadly cuneate to subrounded and often oblique, margin serrations incurved and shortly aristate, apex acuminate to caudate; midvein abaxially prominent but adaxially impressed; secondary veins 11-13 on each side of midvein, slender, evident, curving; tertiary veins abaxially conspicuous. Infructescences ca. 5 mm. Cupule discoid, rim flat when ripe, 3-4 cm in diam., covering base of nut, outside densely prostrate grayish brown tomentose, inside with an erect orangish brown feltlike tomentum, wall ca. 4 mm thick; bracts in 8-10 rings, margin denticulate but apical 2 or 3 entire. Nut oblate, 1.5-2 × ca. 2 cm, apex flattened; scar ca. 2 cm in diam., depressed; stylopodium persistent, raised, puberulent. Fl. Mar-Apr, fr. Aug-Dec of following year.

* Broad-leaved evergreen forests in mountains; 200-1500 m. SW Guangdong, Guangxi, Guizhou, Hainan, Hunan