Habit: tree

Elevation (m): 100 m

Distribution: other countries: Vietnam

Young Branch: glabrous, stout

Leaf upper surface: glabrous

Leaf texture: thickly leathery

Leaf lower surface: glabrous, glandular

Leaf length (cm): 23.5-33 cm

Leaf width (cm): 6-8 cm

Leaf shape: linear-oblong

Leaf margin: serrulate

Leaf apex: acute

Leaf base: cordate

Lateral vein: pairs: 14-20

Petiole length (mm): 10-15 mm

Petiole: glabrous

Flower: solitary

Flower position: subterminal

Flower diameter (cm): 6-7 cm

Pedicel length (cm): 1.2-1.5 cm

Pedicel hairiness: glabrous

Bractlet number: 5-6

Bractlet: persistent

Bractlet position: spirally arranged on the pedicel

Bractlet shape: lunate, ovate

Branchlet length (mm): 1-7 mm

Bractlet hairiness: glabrous inside, pubescent outside

Sepal: persistent

Sepal number: 5-6

Sepal shape: broadly ovate, ovate

Sepal length (mm): 10-13 mm

Sepal hairiness: glabrous inside, pubescent outside

Petal number: 10

Petal shape: obovate

Petal apex: round

Petal length (mm): 25-35 mm

Petal width (mm): 18-25 mm

Petal hairiness: pubescent outside, pubescent inside

Petal: basally slightly connate

Stamen length (mm): 20-25 mm

Filaments hairiness: pubescent

Filaments: the base of outer filaments connate, not forming a tube

Ovary: pubescent

Ovary shape: ovate

Relative length of stamens and styles: stamens longer than styles

Style number: 5

Style length (mm): 15 mm

Style hairiness: pubescent

Style: free