 The authors noted that India became separated from Antarctica, and therefore also all other continents, approximately at the beginning of late Aptian, so the presence of grasses in both India and China during the Cretaceous indicates that the ancestor of Indian grasses must have existed before late Aptian.Wu, You & Li considered the Barremian origin for grasses to be probable.The relationships among the three subfamilies Bambusoideae, Oryzoideae and Pooideae in the BOP clade have been resolved