Callitriche japonica ("Awagoke")

Japanese name: アワゴケ （泡苔）
Scientific name: Callitriche japonica

[Overview]
An annual found in shaded, humid places.
The stems are 1–4 cm long, branch freely, root along the stem, and cover the ground.
Leaves are simple, opposite and dense, obovate to obovate-orbicular, 2–5 mm long including the leaf stalk and 1–3 mm wide.
There are male and female flowers.
The flowers are borne singly in the leaf axils and have no petals.
The male flower has one stamen 0.5 mm long inside two bracts.
The female flower has one pistil 0.3 mm long inside two bracts.
The fruit is a gunbai (war fan)-shaped mericarp 1 mm long and 0.8 mm wide, with wing-like margins.

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