上思青冈 shang si qing gang

Quercus delicatula Chun & Tsiang, J. Arnold Arbor. 28: 324. 1947.

Trees to 13 m tall. First-year branchlets ca. 2 mm thick, glabrous. Petiole slender, 1-2 cm, glabrous; leaf blade ovate, oblong-elliptic, or sometimes obovate-elliptic, 6-9 × 2-3.5 cm, papery, base cuneate, margin entire or shallowly crenate toward apex, apex caudate; secondary veins 7 or 8 on each side of midvein, abaxially slightly raised, glabrescent; tertiary veins abaxially inconspicuous to obscure. Infructescence ca. 1 cm, with 1 or 2 fruit. Cupule cupular, ca. 1.5 × 1.6-1.8 cm, enclosing ca. 1/3 of nut, outside and inside grayish brown and pubescent, wall ca. 1 mm thick; bracts in 7 or 8 rings, margin of apical 2 or 3 entire, others denticulate. Nut ellipsoid, 2-2.5 × ca. 1.5 cm, at least apically velutinous, base and apex rounded; scar ca. 5 mm in diam., flat; stylopodium persistent, umbonate. Fl. Apr-May, fr. Oct-Nov.

* Mixed mesophytic forests in mountains; 300-700 m. Guangdong, Guangxi, Hunan