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Tetramolopium filiforme is a rare species of flowering plant in the aster family known by the common name ridgetop tetramolopium .. Tetramolopium. Tetramolopium. aster family. Asteraceae. It is endemic to Hawaii , where it is known only from the Waianae Mountains on the island of Oahu .. endemic. Endemism. Hawaii. Hawaii. Waianae Mountains. Waianae Mountains. Oahu. Oahu. It is threatened by habitat degradation caused by feral goats and introduced species of plants .. introduced species. introduced species. It is a federally listed endangered species of the United States .. endangered species. endangered species. This plant is a very small shrub growing only 15 centimeters in maximum height .. shrub. shrub. It produces narrow leaves and inflorescences of up to 4 flower heads .. flower heads. Head ( botany ). It grows on mountain ridges and cliffs .. It sometimes grows in rock cracks on steep cliffs .. There are six known populations of this plant , totalling 2857 mature individuals and 625 juveniles .. There are two varieties of this species , var .. filiforme and var .. polyphyllum , which differ in the shape of the leaves .