Description from Flora of China
Michelia cathcartii J. D. Hooker & Thomson, Fl. Ind. 1: 79. 1855; Magnolia cathcartii (J. D. Hooker & Thomson) Nooteboom.
Trees, to 50 m tall, to 50 cm d.b.h. Young twigs pubescent; terminal vegetative buds long conic, white villous. Petiole 1.5-2 cm, without a stipular scar; leaf blade ovate to elliptic-ovate, 8-18 cm, leathery, base rounded to broadly cuneate, adaxially glossy, secondary veins 12-15 on each side of midvein, slender, and ends inconspicuously netted with dense reticulate veins. Spathaceous bract green, just basal to tepals. Peduncle ca. 1.5 cm. Tepals 9, white, with pellucid glands, ca. 9-veined; outer 3 tepals oblong, 5.5-6 × 2-2.2 cm; tepals of inner 2 whorls obovate-elliptic, slightly shorter and smaller than outer ones. Stamens ca. 4 cm; connective exserted and forming a mucro; anthers ca. 2.8 cm. Gynophore ca. 1 cm; gynoecium cylindric, ca. 2 × 0.3 cm; carpels ca. 30. Fruit 3.5-4 cm; mature carpels compressed globose, white lenticellate. Fl. May, fr. Aug-Sep. 2n = 38.
Evergreen broad-leaved forests; 1800-2700 m. SE Xizang, S and W Yunnan [Bhutan, India (Assam, Sikkim), Myanmar, Vietnam].