Habit: shrub, tree

Plant Height (m): 2-8 m

Elevation (m): 330-1800 m

Distribution: China: Yunnan

Young Branch: glabrous

Leaf upper surface: glabrous

Leaf texture: leathery

Leaf lower surface: glabrous, glandular

Leaf length (cm): 10-19.5 cm

Leaf width (cm): 5-9.5 cm

Leaf shape: oblong-elliptic, obovate-elliptic, elliptic

Leaf margin: serrulate

Leaf apex: caudately acuminate

Leaf base: broadly-cuneate, cuneate

Lateral vein: pairs: 9-10

Petiole length (mm): 10-15 mm

Petiole: glabrous

Flower: solitary

Flower position: axillary, subterminal

Flower diameter (cm): 3.5-4.5 cm

Pedicel length (cm): 0.6-0.8 cm

Bractlet number: 5-6

Bractlet position: spreading, arranged on the pedicel, not cover the pedicel

Bractlet shape: ovate, semiorbicular

Branchlet length (mm): 1-2 mm

Bractlet width (mm): 2-3 mm

Bractlet hairiness: glabrous outside, pubescent inside, pubescent outside, margin ciliated

Sepal: leathery

Sepal number: 5

Sepal shape: suborbicular

Sepal length (mm): 7-9 mm

Sepal hairiness: glabrous outside, margin ciliated, pubescent inside, pubescent outside

Petal number: 7-8

Petal color: yellow

Petal shape: suborbicular, oblong-elliptic

Petal apex: retuse

Petal length (mm): 13-30 mm

Petal width (mm): 11-20 mm

Petal hairiness: glabrous inside, pubescent inside

Petal: basally slightly connate

Stamen length (mm): 18 mm

Filaments hairiness: glabrous

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

Ovary: glabrous, grooved

Ovary shape: ovate

Ovary locus: 3-locular

Relative length of stamens and styles: stamens shorter than styles

Style number: 3

Style length (mm): 20 mm

Style: free

Fruit shape: biorbicular, flat triorbicular, orbicular

Fruit height (cm): 4-6 cm

Fruit diameter (cm): 6-8 cm

Seed shape: semiorbicular

Seed color: castaneous

Seed hairiness: pubescent