Habit: shrub, tree

Plant Height (m): 2-5 m

Elevation (m): 260-600 m

Distribution: other countries: Vietnam

Young Branch: pubescent, tenuous

Leaf upper surface: glabrous

Leaf texture: leathery

Leaf lower surface: glabrous, midrib hairy, glandular, with papilla

Leaf length (cm): 10-15 cm

Leaf width (cm): 3.5-5.5 cm

Leaf shape: oblong-elliptic, oblong

Leaf margin: serrulate

Leaf apex: caudate

Leaf base: subcordate, rounded

Lateral vein: pairs: 8-10

Petiole length (mm): 3-5 mm

Petiole: glabrous, pubescent

Flower: solitary

Flower position: subterminal

Pedicel length (cm): 0.6-1 cm

Bractlet number: 6-7

Bractlet: persistent

Bractlet shape: broadly ovate, lunate, semiorbicular

Branchlet length (mm): 1-4 mm

Bractlet hairiness: glabrous inside, glabrous outside, pubescent outside

Sepal: leathery

Sepal number: 5-6

Sepal shape: broadly ovate, suborbicular

Sepal length (mm): 13-17 mm

Sepal width (mm): 8-15 mm

Sepal hairiness: margin ciliated, pubescent on both sides

Petal number: 10-13

Petal color: yellow

Petal shape: obovate, sepal-shaped

Petal length (mm): 15-28 mm

Petal width (mm): 10-15 mm

Petal hairiness: pubescent on both sides

Stamen length (mm): 20 mm

Filaments hairiness: pubescent

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

Ovary: pubescent

Ovary shape: ovate

Ovary locus: 5-locular

Relative length of stamens and styles: equal

Style number: 5

Style length (mm): 20 mm

Style hairiness: pubescent

Style: free