Slender flexuous branches, rather small leaves and spines; corolla funnelform, ca. 5 mm long; small fruits, becoming bright red. This species is relatively frequently collected (for Catesbaea).

Catesbaea fuertesii has been separated from most other Hispaniolan Catesbaea species by its ovules and seeds that are 1-2 per locule. Hiere only Catesbaea microcarpa of Haiti also has 1-2 ovules and seeds per locule; Catesbaea microcarpa was distinguished from Catesbaea fuertesii by by its slightly smaller leaves and slightly larger corollas (Liogier, 1995: 227), and the fruit color of Catesbaea microcarpa has not been noted. Catesbaea fuertesii is similar to Catesbaea parviflora, with white fruits with several seeds per locule. Catesbaea parvifolia is also similar to these species and also perhaps should be studied.