Species in the genus Ampelopsis :

Ampelopsis glandulosa var. heterophylla / Nobudou
Ampelopsis glandulosa var. heterophylla f. citrulloides / Kirehanobudou

Ampelopsis glandulosa var. heterophylla f. citrulloides /  Kirehanobudou キレハノブドウ

Ampelopsis glandulosa var. heterophylla f. citrulloides is a perennial liana occurring in fields and mountains whose bases lignify. Young stems have coarse hairs, with dichotomous tendrils at nodes where they become opposite to leaves. Leaves are alternate, 6-12cm long, 5-9cm wide, pentagonal orbicular, deeply cut into 3-5 with lobes with pointed tips. The leaves are thick, with glossy surfaces, coarse hairs on the backsides' veins, and coarse serrations on the margins. Cymes appear oppositely with the leaves and set many flowers. The flowers are about 3mm across, light green, and five-petalled. Sap fruit is 6-8mm in diameter, spherical, and matures in green-white, purple, and blue. Bloom time: July-August.