N a gentianaceous perennial, Blackstonia perfoliata, that is related to centaury and has waxy grey foliage and yellow flowers: characteristically found on chalk turf 贯叶克劳拉草
N（名词） a gentianaceous perennial, Blackstonia perfoliata, that is related to centaury and has waxy grey foliage and yellow flowers: characteristically found on chalk turf 贯叶克劳拉草