Description from Flora of China
Neocinnamomum complanifructum S. K. Lee & F. N. Wei; N. hainanianum C. K. Allen.
Shrubs, 3-4 m tall. Branchlets dark brown, terete, striate, densely pubescent initially but soon glabrate. Buds small; bud scales thick, densely rusty strigose. Leaves alternate or sometimes subopposite on young branchlets; petiole (0.5-)1-1.5 cm, concave-convex, densely rusty pubescent; leaf blade brownish abaxially when dry, brown adaxially, ovate to broadly ovate, (5.5-)8-12 × (2.5-)4-7.5 cm, papery, densely rusty pubescent on both surfaces when young and abaxially when mature, subglabrate adaxially except on veins when mature, trinerved, midrib elevated abaxially, impressed adaxially, basal lateral veins opposite and oblique, extending to upper 1/3 or near leaf apex, always with some conspicuous veinlets outside, other lateral veins oblique, arising from upper part of midrib, transverse veins conspicuous, veinlets reticulate, ± conspicuous on both surfaces, base broadly cuneate, subrounded, or subtruncate, apex acuminate, acumen obtuse. Flowers unknown. Infructescence axillary, solitary, pedunculate; peduncle 2-5 mm. Fruit ellipsoid-globose, subglobose, or oblate, 1.5-2(-2.5) × 0.9-1.5(-2) cm; perianth cup in fruit crateriform, 1-1.2 cm wide on top; perianth lobes in fruit persistent, densely rusty pubescent, subequal, thickened, wilting, outer ones ovate, ca. 3 × 2.7 mm, inner ones ovate-oblong, ca. 5 × 4 mm; fruit stalk 1-1.3 cm, dilated toward apex. Fl. Aug, fr. Oct-May of next year.
Dense forests, watersides in valleys; 400-500 m. S Guangxi, SW Guizhou, Hainan, SE Yunnan [N Vietnam].