We report the first record of Hippeastrum puniceum (Lam.) Kuntze in Maranhão and expand the known geographical distributions of Alophia drummondii (Graham) R. Foster and Rapatea paludosa Aubl. in that state. Alophia drummondii and Hippeastrum puniceum were collected in Cerrado fragments in the municipality of Caxias and Rapatea paludosa in a swamp-forest gallery in a transition area between the Amazon region and the Cerrado in the municipality of Morros. Ecological and taxonomic information is included, as well as morphological descriptions, identification keys to species, distribution maps, photographs, and preliminary conservation statuses of these species in Brazil.