herbaceous perennial has fluffy spikes of white,
pink, red or purple flowers in the summer. Most
of the species which are native to
Japan have delicate, compound leaves
with the exception of A. simplicifolia
which has simple leaves.
The species seem to be
tolerant of sun or shade and will thrive in
moist conditions near ponds or streams. About
the only condition they do not tolerate well is
hot, dry. Species and cultivars can vary in
height from 8-12 inches up to 40 inches.
From the Greek for "without" and "brightness".