思茅青冈 si mao qing gang

Quercus xanthotricha A. Camus, Chênes, Atlas 2: 119. 1935-1936; Cyclobalanopsis fuhsingensis (Y. T. Chang) Y. T. Chang ex Y. C. Hsu & H. W. Jen; Q. djiringensis A. Camus; Q. fuhsingensis Y. T. Chang.

Trees to 8 m tall. Branchlets slender, dark purple, finely sulcate, sparsely lenticellate by 2nd year; lenticels white, small. Petiole 5-10 mm, puberulent; leaf blade narrowly elliptic to elliptic, 5-8 × 1.5-3 cm, subleathery, abaxially grayish green and with simple hairs and base of midvein with brown sericeous hairs, adaxially green, base cuneate, margin apical 1/2 remotely serrulate, apex acuminate; midvein adaxially slightly impressed; secondary veins 8-10 on each side of midvein, slender, evident; tertiary veins abaxially inconspicuous. Infructescences 2-5 cm. Cupule obconic, 4-6 × 6-10 mm, enclosing ca. 2/5 of nut, outside puberulent, inside pale brown sericeous, wall less than 1 mm thick; bracts in 5 or 6 rings, margin denticulate to subentire. Nut ovoid to ellipsoid, 0.9-1.3 × 0.7-1 cm; scar 4-6 mm in diam., convex; stylopodium persistent, raised, puberulent.

Mixed mesophytic forests in mountains; 800-1300 m. Yunnan [Laos, Vietnam]