|Hydrangea serrata var.
megacarpa, a deciduous shrub with brown branches, inhabits
somewhat dark and damp places along streams deep in the mountains.
Leaves, with 2-5cm long petioles, are alternate; blades are 10-17cm
long, 6-10cm wide, in a broad-oblong to oval-like broad-oblong, with
sharp tips, bases broadly cuneate, and significant serrations on
margins. Branch tips bear 10-17cm-in-diameter corymbs; 2.5-4cm
across ornamental flowers are blue to light blue, and sepals are
broad-oval to rhombus-like orbicular and somewhat overlapping, with
a small number of dentition-like serrations on margins. Bloom time: