Habit: Thymopsis brittonii is a highly branched perennial up to 30 cm in height (usually less). Leaves arranged oppositely, rhombic/ovate/elliptic, to 1 cm in length and 5 mm wide, glandular punctate abaxially, with an entire to revolute margin and acute leaf apex. Vegetation pubescent to glabrous.
There are both perfect and imperfect (carpellate) flowers in few flowered heads. The pubescent heads are sessile terminally and axillary.
The incomplete, imperfect, flowers have 3, fused, petals with acute lobes, no stamens and an inferior ovary. The complete, perfect, actinomorphic (disc) flowers have a calyx that is reduced to a ridge at the top of the ovary. The corolla has 4 fused petals with acute lobes. There are 5 stamens fused at their base. In both types of flowers, the ovary is inferior with a single locule but only the imperfect flowers have functional ovules. The fruit is an achene at maturity.
Habitat: Thymopsis brittonii grows in wet areas and depressions in Dry Broadleaf Evergreen Formation – Shrublands and Sabal palmetto Woodlands.
Distribution: Thymopsis brittonii is endemic to the Lucayan Archipelago occurring on Cat Island, Exumas, and New Providence.
Medicinal/Cultural/Economic usage: Thymopsis brittonii is not known to be used medicinally in the Bahamas.