In Japan the leaf sheaths are always conspicuously tuberculate-hispid; the older, lower sheaths with disarticulated blades are glabrescent and spotted with tubercles.

• 在日本叶鞘总显著具糙硬毛具瘤；最旧的，更下部的鞘具叶片在后脱落和斑点具小瘤。