Habit: shrub, tree

Distribution: other countries: Vietnam

Young Branch: glabrous

Branchlet macula: absent

Leaf upper surface: glabrous

Leaf texture: leathery

Leaf lower surface: glabrous, glandular

Leaf length (cm): cm

Leaf shape: oblong-elliptic, elliptic

Leaf margin: sharply serrate

Leaf apex: acute

Leaf base: cuneate, rounded

Lateral vein: pairs: 11-13

Petiole length (mm): mm

Petiole: glabrous, sulcate

Flower: solitary

Flower position: axillary

Bract: absent

Pedicel: present

Bractlet number: 6-8

Bractlet shape: lunate, semiorbicular

Branchlet length (mm): 1-3 mm

Bractlet hairiness: glabrous inside, glabrous outside, pubescent outside, sericeous on both sides

Sepal: leathery

Sepal number: 5

Sepal shape: suborbicular

Sepal length (mm): 5-10 mm

Sepal hairiness: glabrous on both sides, margin ciliated

Petal number: 9-10

Petal color: yellow

Petal shape: obovate, suborbicular, obovate-elliptic, oblong

Petal length (mm): 15-30 mm

Petal width (mm): 13-17 mm

Petal: basally slightly connate

Stamen length (mm): 15-23 mm

Filaments hairiness: glabrous

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

Ovary: glabrous

Ovary shape: ovate

Ovary locus: 5-locular

Relative length of stamens and styles: equal

Style number: 5

Style length (mm): 15-20 mm

Style: free