Japanese name: ミヤマニガウリ（深山苦瓜） Scientific name:Schizopepon bryoniifolius
[Overview]
A climbing annual found mainly in deep mountains.
The stem is slender and climbs by twining around other plants with its tendrils.
The tendrils arise opposite the leaves and fork into two.
The leaves are simple and alternate, pentagonal to heptagonal heart-shaped, 5–12 cm in both length and width, with a pointed tip.
The leaf texture is thin and soft, and the upper surface is sparsely hairy.
The leaf margins have irregular, low serrations.
The petioles are long.
There are male plants bearing only male flowers and hermaphrodite plants bearing bisexual flowers.
The male flowers are borne in erect racemes from the leaf axils, while the bisexual flowers are solitary in the leaf axils and hang down on long flower stalks.
The flowers are white, about 0.5 cm across, and the corolla is deeply 5-lobed.
The fruit is an ovoid berry about 1 cm long that splits into 3 when ripe, releasing 1–3 seeds.
The seeds are flat, ovoid and brown.
