Description from Flora of China
Shrubs or trees, 1.5-5 m tall. Young branches grayish brown, glabrous; current year branchlets purplish brown, yellow pubescent; terminal buds oblong, large, glabrous. Petiole ca. 1 cm, pubescent, adaxially grooved; leaf blade elliptic to oblong-elliptic, 12-18(-22) × 3-8.5 cm, leathery, abaxially pale green, reddish brown glandular punctate, and sparsely pubescent, adaxially dark green, shiny, and glabrous, midvein abaxially elevated and adaxially channeled, secondary veins 9-11 on each side of midvein, abaxially elevated, and adaxially impressed, base rounded to obtuse, margin serrulate, apex abruptly shortly caudate to caudate. Flowers axillary, solitary, ca. 5 cm in diam. Pedicel ca. 5 mm; bracteoles 5 or 6, ± covering pedicel, lunate, 1-2.5 mm, glabrous, margin ciliolate. Sepals 5, ovate to broadly ovate, 6-10 mm, glabrous, margin ciliolate. Petals 11 or 12, yellow; outer 4 or 5 petals obovate to obovate-elliptic, 1.3-2 × 0.9-1.5 cm, nearly distinct; inner petals obovate, ca. 3 × 1.5-1.8 cm, basally connate for 4-5 mm, apex rounded. Stamens ca. 2 cm, glabrous; outer filament whorl basally connate into a ca. 5 mm tube. Ovary ovoid, ca. 2 mm in diam., glabrous, 3-loculed; styles 3, distinct, 2-2.3 cm. Capsule oblate, 2-coccal, ca. 3 cm in diam., glabrous; pericarp 1-1.5 mm thick. Seeds brown, pubescent. Fl. Jan-Mar, fr. Oct. 2n = 30*.
● Evergreen broad-leaved forests on calcareous hills; 100-500 m. Guangxi (Longzhou).