Stephania tuberosa Forman

Stems ?annual, containing orange-brown sap and arising from large tuber to c. 90 cm diam. Leaves: petiole 5–18 cm long, inserted 9–40 mm from basal lamina margin; lamina broadly ovate to triangular-ovate, 6–21 cm long, 6–16 cm wide, rounded to truncate at base, rounded-obtuse at apex, glabrous, glaucous below, drying membranous. Male inflorescence slender, twice-umbellate, 4–8 cm long, glabrous. Male flowers: pedicel 3–4 mm long; sepals 6, 1.25–1.5 mm long, ?orange-brown, glabrous, the outer 3 narrower; petals 3, 1.25 mm long, orange-brown, glabrous; synandrium 0.5 mm long, slightly domed at apex. Female plant unknown.