Habit: Metastelma angustifolium grows as a glabrous, climbing vine to over 1 m in length. The leaves are oppositely arranged, to 8 cm, linear, with an entire margin and acute leaf apex.
The complete, perfect, actinomorphic flowers are arranged in axillary cymes. The calyx has 5 unfused sepals. The corolla has 5 unfused, glabrous greenish white to purple petals. There are 5 unfused stamens. Within the flower there are appendages (crown) that arise from the corolla. The superior ovary has 2 locules with many ovules. The fruit is a follicle at maturity.
Habitat: Metastelma angustifolium grows near fresh and saltwater wetlands as well as Dunes and along roadsides.
Distribution: Metastelma angustifolium occurs on all island groupings within the Lucayan Archipelago, Cuba, and the southern United States.
Medicinal/Cultural/Economic usage: Metastelma angustifolium is not known to be used medicinally in the Lucayan Archipelago.