细叶青冈 xi ye qing gang

Quercus glauca Thunberg f. gracilis Rehder & E. H. Wilson in Sargent, Pl. Wilson. 3: 228. 1916; Cyclobalanopsis glauca (Thunberg) Oersted var. gracilis (Rehder & E. H. Wilson) Y. T. Chang; C. pseudoglauca Y. K. Li & X. M. Wang; C. shennongii (C. C. Huang & S. H. Fu) Y. C. Hsu & H. W. Jen; Q. ciliaris C. C. Huang & Y. T. Chang; Q. gracilis (Rehder & E. H. Wilson) Wuzhi (1976), not Korthals (1844) nor Lange (1865); Q. liboensis Z. K. Zhou; Q. shennongii C. C. Huang & S. H. Fu.

Trees to 15 m tall. Branchlets tomentose when young, glabrescent. Petiole 1-1.5 cm; leaf blade oblong-ovate to ovate-lanceolate, 4.5-9 × 1.5-3 cm, abaxially whitish and with prostrate simple hairs, adaxially bright green, base cuneate to subrounded, margin apical 2/3 sharply serrulate, apex acuminate to caudate; secondary veins 7-13 on each side of midvein, slender, inconspicuous (especially near margin); tertiary veins abaxially inconspicuous. Female inflorescences 1-1.5 cm, rachis and bracts tomentose; cupules 2 or 3, borne apically. Cupule bowl-shaped, 6-8 mm × 1-1.3 cm, enclosing 1/3-1/2 of nut, outside and inside with prostrate grayish brown tomentose hairs; bracts in 6-9 rings, margin of basal 2 conspicuously dentate, others denticulate. Nut ellipsoid, 1.5-2 × ca. 1 cm, apex hairy; scar ca. 5 mm in diam., slightly convex; stylopodium persistent, short. Fl. Apr-Jun, fr. Oct-Nov.

* Mixed mesophytic forests in mountains; 500-2600 m. Anhui, Fujian, Gansu, Guangdong, Guangxi, Guizhou, W Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Sichuan, Zhejiang

Part of the Cyclobalanopsis glauca complex but with smaller leaves than is typical for that species, C. gracilis could nevertheless be treated as conspecific with C. glauca.