Key for Bougainvillea Comm. ex Juss.

1	Leaves and stems glabrate; perianth tube distinctly 5-angled below, glabrate or puberulent with antrorsely curved, to 0.5 mm long hairs Bougainvillea glabra
1'	Leaves and stems villous; perianth tube veined but not distinctly angular below, densely pubescent with spreading, straight, to 1 mm long hairs Bougainvillea spectabilis