Habit: tree

Plant Height (m): 6-10 m

Distribution: other countries: Cambodia, Vietnam

Young Branch: stout

Leaf upper surface: glabrous

Leaf texture: leathery

Leaf lower surface: glabrous, glandular

Leaf length (cm): 11-20 cm

Leaf width (cm): 4-8 cm

Leaf shape: oblong-elliptic, elliptic-ovate, ovate

Leaf margin: serrulate

Leaf apex: acute, obtusely pointed

Leaf base: rounded

Lateral vein: pairs: 10

Petiole length (mm): 4-10 mm

Petiole: glabrous, sulcate

Flower: solitary

Flower position: subterminal

Flower diameter (cm): 5.5 cm

Pedicel: absent

Bractlet number: 4

Bractlet: persistent

Bractlet shape: lunate, semiorbicular

Branchlet length (mm): 2.5-5 mm

Bractlet hairiness: glabrous inside, pubescent outside

Sepal: leathery, persistent

Sepal number: 5-6

Sepal shape: orbicular

Sepal length (mm): 8-14 mm

Sepal width (mm): 7-13 mm

Sepal hairiness: pubescent on both sides

Petal number: 12

Petal color: yellow

Petal shape: obovate

Petal length (mm): 20-35 mm

Petal: free

Stamen length (mm): 25 mm

Filaments hairiness: glabrous

Filaments: lower half of outer filaments connate into a short tube

Ovary: glabrous, grooved

Ovary locus: 5-locular

Relative length of stamens and styles: equal

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

Fruit shape: oblate

Fruit height (cm): 2.5 cm

Fruit diameter (cm): 3.5 cm

Seed number per locule: 2, 3 or more

Seed shape: semiorbicular

Seed color: brown