A Taxonomic Revision of the Acaulescent Blue Violets (Viola) of North America

Trees in the Life of the Maya World

Emanuel D. Rudolph's Studies in the History of North American Botany with an Appendix on the Relationship between Science and Religion

Flora de Manantlán. Plantas Vasculares de la Reserva de la Biosfera Sierra de Manantlán Jalisco-Colima, México

Aster & Brachyactis (Asteraceae) in Oklahoma

Wild Flowers of Mombacho (Nicaragua)

Niebla and Vermilacinia (Ramalinaceae) from California and Baja California

Floristics in the New Millennium: Proceedings of the Flora of the Southeast US Symposium

The Grasses of Barbados (Poaceae)

The Genus Psychotria (Rubiaceae) in the Philippine Archipelago

The Genus Mikania (Compositae: Eupatorieae) in the Greater Antilles

The Genus Mikania (Compositae: Eupatorieae) in Mexico

Checklist of the Vascular Plants of Tennessee

Plant Diversity of the Iwokrama Forest, Guyana