Habit: Spermacoce savannarum grows as an elongated perennial, slightly woody, sub-shrub up to 1 m (usually shorter) in height. Branches quadrangular. The leaves are arranged oppositely with toothed stipules between the petioles. The sessile leaves are lax, linear, up to 4 cm long (typically shorter) and 1 mm wide, with an apiculate leaf apex and an entire margin. The internodes are usually longer than the leaf length.
The, actinomorphic, perfect, complete, flowers occur in terminal heads at the ends of branches and are subtended by shorter leaves. The calyx has 4 fused at the base, glabrous linear lobed sepals. The corolla has 4 fused, glabrous, white, petals that form a short tube and each slightly recurved lobe with an ovate 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 savannarum grows in Coccothrinax Woodlands and in sandy coastal shrublands.
Distribution: Spermacoce savannarum is endemic to the Lucayan Archipelago occurring on the southern islands.
Medicinal/Cultural/Economic usage: savannarum is not known to be used medicinally in the Bahamas.