Japanese name: オオヤマフスマ（大山衾） Scientific name:Arenaria lateriflora
[Overview]
A perennial 10–20 cm tall, found in deciduous forests and grasslands in the mountains.
The stem is slender and has downward-pointing hairs.
The leaves are simple and opposite, 1–3 cm long and 0.3–1 cm wide, broadly elliptic to oblanceolate, with entire margins.
The veins on the underside of the leaves and the margins are hairy.
There is no leaf stalk.
The flowers are borne singly at the stem tip or in the leaf axils, or 2–3 together in a cyme.
The flowers are about 1 cm across, white with 5 petals, and the petals are twice as long as the calyx.
The sepals are ovate, and the midrib on the back is hairy.
The flower stalks have short downward-pointing hairs.
There are 10 stamens.
The fruit is a broadly ovate capsule 3.5–5.5 mm long.
The seeds are dark brown and glossy, with a white appendage (strophiole).
