Stapfiophyton tetrandrum (Diels) H. L. Li.

Herbs, repent, stoloniferous, rooting at nodes, nodes inflated. Stems 4-sided, densely ferruginous setose. Petiole 5-9(-14) cm, furfuraceous puberulous and sparsely setose; leaf blade elliptic, ovate, or rarely suborbicular, 6.5-12.5 × 5.5-9.5(-10.5) cm, papery to substiffly papery, both surfaces furfuraceous puberulous, abaxially sometimes sparsely setose on veins, secondary veins 3 on each side of midvein, base cordate, margin entire, apex acute, obtuse, or retuse. Inflorescences terminal, umbellate or cymose, (5-)9-26 cm, 3-12-flowered; peduncle (4-)8-24 cm. Pedicel 5-12 mm to subsessile, furfuraceous puberulous and sparsely setose. Hypanthium funnel-shaped, ca. 5 mm, 4-sided, furfuraceous puberulous, sparsely setose. Calyx lobes broadly triangular-ovate, furfuraceous puberulous. Petals pink, rose-colored, or rarely red, ovate to subelliptic, ca. 6 mm. Stamens 4, pink, ca. 1.3 cm; anthers ca. 7 mm; connective decurrent, forming a short spur. Ovary ovoid, apex with a membranous crown. Capsule funnel-shaped, ca. 4 mm in diam., 4-sided; hypanthium exceeding capsule, furfuraceous puberulous. Fl. Dec or Mar-May, fr. May-Jun.

Dense forests, mountain slopes, valleys, shaded damp places; 1000-1700(-2000) m. Hainan, Yunnan [Vietnam].