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Home » Plant infomation

Dioscorea japonica  Thunb.


Botanical Name


Dioscorea japonica Thunb.

English Name


Glutinous Yam





General Info


Tubers vertical, long cylindric, to 3 cm in diam.; cork yellowish brown; transverse section white or yellowish white. Stem twining to right, green, sometimes light purplish red. Bulblets often present. Leaves alternate basally on stem, opposite distally on stem, simple; petiole 1.5--4(--6) cm; leaf blade drying yellowish green to light brownish, broadly ovate basally on stem, usually triangular-lanceolate to linear distally on stem, 3--12(--19) × 1--6(--18) cm, membranous or papery, glabrous, basal veins 5--9, base sagittate or hastate to cordate or ± truncate, margin entire, apex acute to long acuminate. Male spikes 3--5 together, rarely solitary, ± erect or ascending, 2--8 cm; rachis straight, occasionally slightly zigzagged at apex. Male flowers perianth greenish white or light yellow, lobes purple spotted, ovate or ovate-elliptic, to 2 × 1.5 mm, inner ones smaller than outer; stamens 6. Female spikes solitary or 2 or 3 together, 6--20 cm. Female flowers staminodes 6. Capsule not reflexed, pale brown with darker, linear freckles, oblate, 1.5--2(--2.5) cm, base truncate, apex emarginate; wings 0.7--1.5(--2) cm wide, margin dark. Seeds inserted near middle of capsule, D-shaped, ca. 1.9 cm, winged all round.

Herb Effects



Plants for a Future



Medicinal Use

For diarrhoea, enteritis, enuresis and spermatorrhoea (tubers); as contraceptives and in the treatment of various disorders of the genitary organs as well as in a host of other diseases such as asthma and arthritis (roots)



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