Description from Flora of China
Tetrathyrium subcordatum Bentham, Fl. Hongk. 133. 1861.
Shrubs or trees to 12 m tall; branchlets glabrous. Stipules lanceolate, 5–6 mm, stellately pubescent; petiole 1–1.5 cm; leaf blade ovate or elliptic, 7–12 × 3.5–5 cm, discolorous, base rounded or subcordate, margin entire or sparsely serrulate, apex acute; lateral veins 6–8 on each side, abaxially prominent, glabrous, adaxially impressed. Inflorescence axillary, 14–25-flowered; peduncle 4–5 cm; bracts linear, ca. 3 mm. Sepals ca. 1.5 mm, stellately pubescent. Petals ca. 1.5 cm; anthers ovoid; staminodes divergent, teeth oblong-ovate, ca. 2.5 mm. Ovary stellately pubescent. Persistent floral cup ca. 2/3 as long as capsule; capsules subglobose, 10–12 mm in diam., adnate to floral cup for 1/4–1/2 of their length. Seeds 6–7 mm. Fl. Apr–Jun, fr. Jul–Aug.
This species is listed as endangered by the IUCN (as Tetrathyrium subcordatum).
Roadsides; 100--200 m. Guangdong, SW Guangxi (Longzhou Xian), Guizhou.