Aconogonon weyrichii var. weyrichii("Urajirotade")
Japanese name: ウラジロタデ（裏白蓼） Scientific name:Aconogonon weyrichii var. weyrichii
[Overview]
A perennial 30–100 cm tall, growing on sandy and gravelly ground in alpine areas and in the north.
It has a thick underground rhizome.
The stem is somewhat branched and densely covered with downward-pointing hairs.
The leaves are simple and alternate, 10–20 cm long and 10–15 cm wide, long-ovate to ovate, with sharply pointed tips.
The leaf margins are entire.
The upper surface of the leaves has short hairs, and the underside is densely covered with white cottony hairs.
At the base of the petiole there is a stipular sheath 3–3.5 cm long.
The stipular sheath is membranous with longitudinal veins and is hairy.
It is dioecious, but bisexual flowers may also be produced.
A large conical raceme at the stem tip bears many yellowish white flowers.
The flowers have no petals, and the petal-like calyx is deeply divided into 5 lobes.
The calyx lobes are 1.5–3 mm long.
Male flowers have 8 stamens and 1 rudimentary pistil; female flowers have a style divided into 3 lobes.
The fruit is an achene 8–10 mm long, with 3 broad wings, and is broadly elliptic.
In the fruiting stage, the female inflorescence takes on a reddish tinge.
