Habit: shrub, tree

Plant Height (m): 2-8 m

Elevation (m): 1300-2400 m

Distribution: China: Yunnan

Distribution: other countries: Burma

Young Branch: glabrous

Terminal bud hairiness: glabrous, puberulous

Leaf upper surface: glabrous

Leaf texture: leathery

Leaf lower surface: glabrous

Leaf length (cm): 8.5-15 cm

Leaf width (cm): 3-3.5 cm

Leaf shape: oblong-elliptic, elliptic

Leaf margin: serrulate, undulately serrate

Leaf apex: acuminate, acute, obtusely pointed

Leaf base: broadly-cuneate, cuneate

Lateral vein: pairs: 7-8

Petiole length (mm): 5-10 mm

Petiole: glabrous

Flower: solitary, 2-5 flowers clustered

Flower position: axillary

Flower diameter (cm): 5 cm

Pedicel length (cm): 1 cm

Pedicel hairiness: glabrous

Bractlet number: 2-4

Bractlet: early deciduous

Sepal: leathery, persistent

Sepal number: 5

Sepal shape: ovate

Sepal length (mm): 3-4 mm

Sepal width (mm): 4-6 mm

Sepal hairiness: glabrous outside, margin ciliated, sericeous inside

Petal number: 7-10

Petal color: white

Petal shape: obovate, broadly obovate

Petal apex: round

Petal length (mm): 15-35 mm

Petal width (mm): 10-20 mm

Petal: basally slightly connate

Stamen length (mm): 20 mm

Filaments hairiness: glabrous

Filaments: lower half of outer filaments connate, not forming a tube

Ovary: pubescent

Ovary locus: 5-locular

Relative length of stamens and styles: equal

Style length (mm): 20 mm

Style hairiness: glabrous, pubescent at the lower part

Style: 5-cleft, 5-parted to the middle

Fruit shape: oblate

Fruit height (cm): 3 cm

Fruit diameter (cm): 5 cm

Seed number per locule: 2

Seed shape: semiorbicular

Seed color: brown