Claim: Phyllosasa are a notohogenus Japanese bamboo that spread in clumps and have very dark green leaves.
Evidence: × Phyllosasa is a nothogenus (genus of hybrid origin) of Japanese bamboo in the grass family. It is a spreading, clump-forming bamboo growing to 2.5 m (8 ft) tall, with very dark green leaves 25 cm (10 in) or more in length.