Perennial herb, 20-30cm high. Leaves long-cordate, glabrous, acute at the apex;petiole long, arising from the rhizome. Flowers tubular, brownish-grey, solitary in theaxil of the leaves. Fruit enveloped in an accresent perianth, bearing numerous seeds of dark-brown colour. Flowering period: April-June. (Laos) Perennial herb, 20 - 30cm high. Leaves long-cordate, glabrous, acute at the apex; petiole long, arising from the rhizome. Plowers tubular, brownish-grey, solitary in the axil of the leaves. Fruit enveloped in an accrescent perianth, bearing numerous seeds of dark-brown colour. (Vietnam)