KEY TO THE SPECIES

1Corolla tube c. 15-16 cm long, white. Calyx teeth horn-like, with a linear apex. Lateral petiolules 5-12 mm
Nyctocalos cuspidata
1'Corolla tube c. 5-6 cm long, tinged palish yellow suffused with pinkish shade. Calyx teeth triangular, acute. Lateral petiolules 2-3 mm
Nyctocalos brunfelsiiflora