毛叶青冈 mao ye qing gang

Quercus kerrii Craib, Bull. Misc. Inform. Kew 1911: 471. 1911; Q. dispar Chun & Tsiang.

Trees to 20 m tall. Branchlets densely tawny tomentose, glabrescent or rarely remaining hairy. Petiole 1-2 cm, tomentose; leaf blade oblong-elliptic, lanceolate, or oblong-oblanceolate, 9-18(-24) × 3-7(-9) cm, densely tawny tomentose when young, glabrescent, abaxially stellate hairy with age, base rounded to broadly cuneate, margin serrate on apical 2/3, apex obtuse to shortly acuminate; midvein flat or adaxially slightly raised; secondary veins 10-14 on each side of midvein; tertiary veins abaxially evident. Female inflorescences solitary, 2-5(-7) cm. Cupule discoid, 5-10 mm × 2-2.5(-3.8) cm, covering base to 1/2 of nut, outside grayish to pale brown tomentose, inside prostrate whitish puberulent, wall ca. 2 mm thick; bracts in 7-11 rings, margin denticulate or entire. Nut oblate, 0.7-1.2 × 2-2.8 cm, apex depressed to flat; scar 1-2 cm in diam., slightly convex; stylopodium persistent, umbonate, grayish sericeous-pubescent. Fl. Mar-May, fr. Oct-Nov.

Sparse forests in mountains; 100-1800 m. Guangxi, Guizhou, Hainan, Yunnan [N Thailand, Vietnam]

This species and Cyclobalanopsis helferiana are closely related, and the relationship between them and their distribution needs further study. As interpreted by Hjelmquist (Dansk Bot. Ark. 23(4): 505. 1968), only C. helferiana, and not C. kerrii, occurs in China.