维西榛 wei xi zhen

Trees small, to 7 m tall. Branchlets purplish brown, pilose and stipitate glandular when young, soon glabrous, with scattered, white lenticels. Petiole 7-20 cm, slender, pilose and stipitate glandular; leaf blade oblong or ovate-oblong, rarely obovate-oblong, 5-10 × 2.5-7 cm, papery, abaxially pubescent along veins, adaxially glabrous or sparsely pilose, base subcordate or obliquely subcordate, margin sharply and doubly serrate, apex acuminate to caudate-acuminate; lateral veins 9-13 on each side of midvein. Female flowers 4-8 in a cluster; peduncle ca. 1 cm, villous; bracts campanulate, 3-3.5 cm, striate, yellow tomentose when young, glabrescent, densely stipitate glandular, apex deeply divided into linear lobes, lobes often reflexed, ca. 2 cm × 2 mm, forked and pinnately lobulate. Nut ovoid-globose, ca. 1.5 cm in diam., glabrous. Fl. Jun-Aug, fr. Aug-Sep.

* Temperate broad-leaved forests; ca. 3000 m. NW Yunnan (Weixi Xian).

An endangered species. The similar Corylus jacquemontii Decaisne, from the Himalayas, differs in having bract lobes ovate-lanceolate, usually not reflexed, without lobules.