Notes For Reference:-

Species, Varieties, or Forms in the Genus Clethra:

Clethra varvinervis / Ryoubu

Clethra varvinervis / Ryoubu リョウブ

Clethra varvinervis is a deciduous small tree with dark, reddish-brown bark, growing to 8-10m in height, and found on hills, mountain ridges, or in dry deciduous forests. Leaves, gathering together on branch tips, are alternate, 6-15cm long, 2-7cm wide, in the shape of an obovate-like oblong, with tips shortly pointed, bases cuneate, sharply pointed serrations on margins, and upper surfaces with no hairs, lower surfaces light green, coarse hairs on midribs, and vellus hairs at bases of veins. Branch tips form several 10-20cm-long racemes, in which many white flowers form. Boom time: June-August.