Rhynchosia caribaea is perennial, herbaceous climber or creeper, growing from a thick, woody rootstock, 0.3–1 m long. The stems are slender and pubescent. The leaves are trifoliate, heart-shaped; terminal leaflet broadly rhombic or triangular, gradually narrowed above to an obtuse or subacute apex, 10–60 × 8–55 mm. Lateral leaflets obliquely rhombic-ovate, with lower margin distinctly convex (gibbous), pubescent or glabrescent, some densely velvety, gland dotted; petiole 5–75 mm long; stipules ovate to lanceolate, acuminate, 2–7 × 0.5–3 mm, at right angles to stem.

The inflorescence in axillary racemes, slender, viscid, 40–230 mm long. The flowers are 9–20 mm long, yellow with purple or dark blue stripes, glabrous. The fruit a pod, 20–35 × 5–9 mm, falcate, not inflated, and covered in long, silky, golden, glandular hairs. The seeds are black. Flowering Time: January–November.