Japanese name: ミヤマタニタデ（深山谷蓼） Scientific name:Circaea alpina subsp. alpina
[Overview]
A perennial 5–18 cm tall, found in damp places in forests of deep mountains and alpine areas.
It has slender underground stems.
The stem is thin and hairless.
Leaves are simple and opposite, triangular-broadly ovate, 1–4 cm long and 0.7–3 cm wide, with a sharply pointed tip and a shallowly heart-shaped base.
The leaf margins have sharp teeth.
The leaf stalk is 1–2 cm long.
It bears short racemes, and the inflorescence is hairless or has glandular hairs.
The flowers are small and white, with 2 petals that are 2-lobed at the tip and slightly shorter than the sepal lobes.
The fruit is a long inversely ovate nut about 0.1 cm in diameter, white and densely covered with hooked hairs.
The flower stalks lengthen when in fruit.
