Habit: Spermacoce capillaris grows as a bushy, semi succulent, perennial up to 40 cm in height spreading to form loose mounds/balls. The sessile leaves are arranged oppositely with toothed stipules between the petioles. The leaves are filiform up to 6 cm long, and 1-2 mm wide with an acute leaf apex and an entire margin. Internodes as long or longer than the leaves.
The, actinomorphic, perfect, complete, flowers occur in small, pubescent heads in the leaf axils and forming terminal heads. A stipular sheath subtends the flowering “head” with many setae. The calyx has 4 unfused, pubescent, triangular, lobed sepals. The corolla has 4 fused pubescent white petals that form a short tube and each with a recurved lobe with a mucronate apex. There are 4 stamens that are fused to the perianth forming a hypanthium. The ovary is inferior with 1 locule and many ovules. The fruit is a capsule at maturity.
Habitat: Spermacoce capillaris grows in Coccothrinax Woodlands and in sandy or rocky coastal shrublands.
Distribution: Spermacoce capillaris endemic to the Lucayan Archipelago occurring in the Turks and Caicos Islands and Great Inagua.
Medicinal/Cultural/Economic usage: Spermacoce capillaris is not known to be used medicinally in the Bahamas.