A Revision of Mesoamerican Psychotria Subgenus Psychotria (Rubiaceae), Part I: Introduction and Species 1-16

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Abstract
Psychotria subgenus Psychotria (Rubiaceae) comprises 61 species and eight varieties of understory shrubs and small trees in Mexico and Central America. The subgenus is most diverse in Panama (40 species) and Costa Rica (32 species), with a secondary center of diversity in southern Mexico (26 species) and Guatemala (26 species). Endemism is also greatest in Panama (15 species). Species-rich regions in Costa Rica and Panama are especially recommended for conservation efforts. The 61 species are grouped into eight species-groups; several group and species complexes contain one wide-ranging species and several species with much smaller ranges. Only one species-rich group, the P. calophylla group, lacks a continuously wide-ranging member.

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