Endemic as its name suggests to the West Indian island of Puerto Rico, the Puerto Rican Emerald is found in most forested habitats on the island, from coastal mangroves to highland summits. The male is largely green, with a blue throat patch, and dark wings and tail, whilst the female is principally off-white below, with whitish tail tips and a short postocular supercilium. It forages at low to medium levels, using a wide variety of nectar sources. The birds probably nest virtually year-round, although the peak breeding season is between February to May. This species and two other Greater Antillean emeralds, the Hispaniolan Emerald (Chlorostilbon swainsonii) and the Cuban Emerald (Chlorostilbon ricordii) were formerly sometimes accorded their own genus, Riccordia.