尖叶柯 jian ye ke

Quercus attenuata Skan in F. B. Forbes & Hemsley, J. Linn. Soc., Bot. 26: 506. 1899; Pasania attenuata (Skan) Schottky; Synaedrys attenuata (Skan) Koidzumi.

Trees 10-15 m tall. Branchlets of last-year growth white farinose. Petiole 1.5-3 cm; leaf blade ovate-elliptic to lanceolate, 7-13 × 2-4 cm, thinly leathery, abaxially glaucous when dry and with adherent, waxy scalelike trichomes, adaxially glabrous, base cuneate and decurrent on petiole, margin entire or sometimes undulate, apex narrowly acuminate; secondary veins 9-13 on each side of midvein, slender, evident; tertiary veins abaxially not visible or obscure. Male inflorescences axillary, paniculate or racemose, 10-14 cm; rachis with grayish, waxy scalelike trichomes. Female inflorescences racemose, 10-12 cm; rachis sulcate, with grayish, waxy scalelike trichomes; cupules often solitary, scattered. Cupule globose, 3-3.5 × 2.5-3 cm, completely enclosing nut, basally slightly narrowed into a stalk, wall less than 0.5 mm thick and crustaceous; basal bracts united into concentric rings, triangular, apical ones reduced to a subulate tip or a wartlike appendage, small and obscure. Nut subglobose, 2-2.5 × 1.8-2.8 cm, white farinose, base flat, apex slightly narrowed and obtuse, wall ca. 0.5 mm thick; scar 7-12 mm in diam., concave to 1-1.5 mm. Fl. Jun-Oct, fr. Jun-Oct of following year.

* Broad-leaved evergreen forests, in coastal mountains; below 1000 m. S Guangdong, SW Guangxi