rooigras
/ˈrɔɪkræs/noun
1- S. African a valuable southern African pasture grass which has a reddish tint in winter〈南非〉阿拉伯黄背草（南非一种冬天呈淡红色的草场禾草）。
1.1
- Themeda triandra, family Poaceae.拉丁名Themeda triandra,禾本科。
词源
late 19th cent.: from Afrikaans, literally 'red grass'.