button grass
noun
mass noun
1- chiefly Austral. a grass or sedge with compact rounded flowering heads〈主澳〉纽扣草。
1.1
- a large tufted sedge (Gymnoschoenus spaerocephalus, family Cyperaceae).裸赤箭莎（拉丁名 Gymnoschoenus spaerocephalus,莎草科）。
1.2
- an annual grass (Dactyloctenium radulans, family Gramineae).搔痒龙爪茅（拉丁名 Dactyloctenium radulans,禾本科）。