Japanese name: タチドコロ（立野老） Scientific name:Dioscorea gracillima
[Overview]
A climbing perennial found in mountains.
It has creeping rhizomes.
The vine is hairless and at first grows upright, but later becomes vine-like.
The leaves are simple and alternate, triangular-ovate to elliptic, 5–10 cm long and 3–7 cm wide, with a pointed tip and a heart-shaped base.
The leaf margin is entire or slightly wavy.
The leaf stalk is long.
The plant is dioecious.
The male inflorescence stands erect from the leaf axil, and the female inflorescence hangs down.
Both male and female flowers are yellow, sometimes tinged with orange; there are 6 tepals, which open flat.
The fruit is a flattened round capsule 1.5–1.6 cm long and 1.8–2 cm wide.
The seeds are about 5 mm across and have a wing around them.
