Notes For Reference:-

Species, Varieties, or Forms in the Genus Isodon:

Isodon inflexus / Yamahakka
Isodon inflexus f. leucanthu / Shirobanayamahakka
Isodon japonicus / Hikiokoshi
Isodon longitubus / Akichouji
Isodon longitubus f. albiflora / Shirobanaakichouji
Isodon shikokianus var. intermedius / Takakumahikiokoshi
Isodon shikokiana var. occidentalis / San'inhikiokoshi
Isodon shikokiana var. occidentalis f. albiflorus / Shirobanasan'inhikiokoshi
Isodon trichocarpus / Kurobanahikiokoshi
Isodon umbrosus / Inuyamahakka

Isodon umbrosus / Inuyamahakka イヌヤマハッカ

Isodon umbrosus is a perennial found in beech forests, with downward hairs on stems and a 20-80cm height. Blades with 0.5-2cm long petioles are of opposite phyllotaxis,5-15cm long,1.5-3.5cm wide, long oblong-like lanceolate, with serrations on margins and sparse hairs on surfaces. Branch tips bear spike-like inflorescences and set blue-purple, 8-9mm long labiate flowers; upper lips bend backward and cleft themselves in four, and lower lip navicular. Bloom time. September-October.