Isodon umbrosus var. latifolius ("Koshin'yamahakka")

Japanese name: コウシンヤマハッカ （甲信山薄荷）
Scientific name: Isodon umbrosus var. latifolius

[Overview]
A perennial 60–90 cm tall, found in woods and at woodland edges.
The stem has downward-pointing hairs and is square in cross-section.
Leaves are simple and opposite, broadly ovate, 4–7 cm long, with many teeth on the margin.
The teeth become larger toward the leaf tip.
Flowers are borne in inflorescences arising from the leaf axils and stem tips.
The flowers are blue-purple and two-lipped.
The fruit splits into 4 mericarps.

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