Habit: Lobelia lucayana grows as an annual herb to 15 cm in height when in flower. The leaves are arranged in a basal rosette, up to 2 cm in length (including the petiole), ovate/orbicular (becoming oblanceolate toward the inflorescence), with an obtuse to acute leaf apex and crenate margins. The leaves and stems are sparsely long-haired pubescent.
The complete, perfect, zygomorphic flowers are arranged in terminal racemes. Each flower subtended by a pubescent bract. The calyx has 5, green, glandular connate, linear, sepals with acuminate lobes. The corolla has 5 fused, blue to white petals in 2 sets (3 upper and side and 2 lower petals) forming an elongate tube that is pubescent towards the base. There are 5 stamens fused to the corolla tube. The inferior ovary has 2 locules and numerous ovules. The fruit is a dark capsule at maturity.
Habitat: Lobelia lucayana grows in shady open flats with rich soils.
Distribution: Lobelia lucayana is endemic to the Lucayan Archipelago and is known to occur in the central and southern islands.
Medicinal/Cultural/Economic usage: Lobelia lucayana is not known to be used medicinally in the Lucayan Archipelago.