Japanese name: クロヅル（黒蔓） Scientific name:Tripterygium regelii
[Overview]
A deciduous woody vine found in forests in the mountains.
Current-year branches are yellowish brown to reddish brown with low ridges, and the previous year's branches are dark purplish brown.
Leaves are simple and alternate, with 4–10 on each current-year branch, ovate to elliptic, 5–15 cm long and 4–10 cm wide.
The leaf margins have large, low teeth.
The petiole is 1–4 cm long.
Cymes gather at the branch tips to form a panicle, bearing many greenish white 5-petaled flowers about 6 mm across.
The fruit is a three-winged samara, 1.2–1.8 cm long and wide, ripening to reddish brown.
