What is "phyllosasa"

× 'Phyllosasa ' is a nothogenus (genus of hybrid origin) of Japanese bamboo in the grass family.

It consists of a single nothospecies of bamboo, Phyllosasa tranquillans, native to woodland in southern Honshu in Japan. It is considered to be a hybrid between Phillostachys nigra var. henonsis and Sasa veitchii f. tyugokensis.

It is a spreading, clump-forming bamboo growing to tall, with very dark green leaves or more in length. The variegated cultivar 'Shiroshima' is found in cultivation.