茨菰 Traditional form: 茨菰 Pinyin (reading): cígu Definitions: arrowhead (Sagittaria subulata, a water plant) Characters: 茨 - thatching; caltrop, Tribulus terrestris 菰 - wild rice; Zizania latifolia Traditional characters: 茨 - thatching; caltrop, Tribulus terrestris 菰 - wild rice; Zizania latifolia