Two new species of Clusia (Clusiaceae) endemic to Costa Rica

Summary During the preparation of Clusiaceae for the Manual de Plantas de Costa Rica , several new species of Clusia L. were identified but left with lettered informal names. Here, we formally describe two of those. Clusia dotana Hammel can be distinguished most assuredly from morphologically related species by its pistillate flowers with 24 – 26 (– 42) staminodes and the unusual large mass of yellow arillate tissue covering the seeds. Clusia osaensis Hammel is similar to C. dotana but distinct by having relatively longer inflorescences (5 – 15 cm vs 4.5 cm), pistillate flowers with 16 staminodes, and seeds covered in an orange aril. These two new species are known from a limited number of localities and are endemic to mountain and lowland forests on the Pacific slopes in central and southern Costa Rica.