5. Machilus chayuensis S. K. Lee, Acta Phytotax. Sin. 17(2): 46. 1979.
察隅润楠 cha yu run nan
Persea chayuensis (S. K. Lee) Kostermans.
Trees, ca. 20 m tall, trunk to 80 cm d.b.h. Bark with lenticels. Branchlets deep brown to brown, glabrous, longitudinally striate. Terminal buds ovoid; bud scales subrounded, leathery, puberulent or pubescent abaxially, margin ciliate, apex acute. Leaves clustered at apex of branchlet; petiole slightly thick, 1.6-2 cm; leaf blade oblong or oblong-oblanceolate, older blades usually 10-13 × 2.6-3.6 cm, sometimes longer and wider, mixed with some smaller ones, ca. 6 × 1.7 cm, leathery, glabrous on both surfaces, midrib elevated abaxially, impressed adaxially, lateral veins 10-13 pairs, abaxially slightly elevated, adaxially plane, more conspicuous abaxially, obliquely ascendant, veinlets inconspicuous on both surfaces, densely reticulate (observed by lens), base cuneate, slightly decurrent to upper part of petiole. Flowers not seen. Infructescences subterminal, 3.5-7.5 cm, glabrous; peduncle red, somewhat thick, 1-4 cm. Fruit green, globose, ca. 1 cm in diam.; persistent perianth lobes oblong, glabrous on both surfaces; surviving filaments glabrous; fruiting pedicel slightly thick, ca. 5 mm. Fr. Jul.
● Open slopes, evergreen forests; ca. 2000 m. SE Xizang (Zayü).