Description from Flora of China
Magnolia xanthantha (C. Y. Wu ex Y. W. Law & Y. F. Wu) Figlar.
Trees, to 30 m tall, to 1 m d.b.h. Twigs blackish brown to grayish yellow, ca. 4.5 mm in diam., scattered with lenticels; buds cylindric, ca. 1.5 cm, glabrous. Stipules free from petiole. Petiole 2-2.5 cm, without a stipular scar; leaf blade elliptic to obovate-elliptic, 15-17 × 6.2-7.5 cm, thinly leathery, both surfaces glabrous, midvein abaxially slightly prominent and adaxially prominent, secondary veins 11 or 12 on each side of midvein, reticulate veins prominent on both surfaces, base cuneate to obtuse, apex shortly cuspidate. Brachyblasts ca. 1.5 cm, glabrous. Flowers fragrant. Tepals 6, in 2 whorls, yellow, narrowly oblong to broadly oblanceolate, 4-5.5 × 1-1.5 cm. Stamens 2.3-2.5 cm; connective exserted and forming a 1-2 mm sharp tip; anthers 1.8-2 cm. Gynophore 2-3 mm; gynoecium cylindric, 1.8-2 cm, densely gray pubescent; carpels many, ovoid, 3-4 mm, densely gray pubescent; styles brown, ca. 1 mm. Fruit ca. 21 cm, pendulous; mature carpels dark brown, scattered with lenticels. Fl. Mar, fr. Sep-Oct.
● Forests; 1300-1400 m. S Yunnan (Xishuangbanna).