SUBTRIBAL CLASSIFICATION OF THE NEW WORLD ERAGROSTIDEAE (POACEAE: CHLORIDOIDEAE) PAUL M. PETERSON Department of Botany National Museum of Natural History Smithsonian Institution Washington, D.C. 20560, U.S.A. ROBERT D. WEBSTER Systematic Botany and Mycology Laboratory Agriculture Research Service Bldg. 003, Rm 235, BARC-West Beltsville, MD 20705, U.S.A. JESUS VALDES-REYNA Departamento de Botdnica Universidad Autonoma Agraria “Antonio Narro” Buenavista, Saltillo Coahuila 25315, MEXICO ABSTRACT A subtribal classification system for 38 genera of Eragrostideae that occur in the New World is presented. Seven recognized subtribes include: Eleusininae, car pien A Reel a Muhlenbergiinae, Munroinae, Sporobolinae, and Uniolinae. A com parative discussion outlining the recent classification history 1s included. Diagnostic fully comparative descriptions are given for each subtribe and a new subtribe, Munroinae, is validated. RESUMEN OQ. Se — un sistema de clasificaci6n tribal de 38 géneros de Eragrostideae que viven e Mundo. Las siete subtribus reconocidas son: Eleusininae, Eragrostidinae, Medion Muhlenbergiinae, Munroinae, Sporobolinae, y Uniolinae. Se incluye unadiscusié6ncomparativaqueesbozalahistoriadelaclasificaci6nreciente.Seofreceuna descripcién diagnéstica comparativa completa de cada subtribu y se valida una nueva subtribu, Munroinae. INTRODUCTION The cribe Eragrostideae in the subfamily Chloridoideae includes approxi- mately 80 genera and 1000 species or about one-tenth of all grasses. These Sipa 16(3); 529 — 544. 1995