Monograph of Northern Mexican Crataegus (Rosaceae, subfam. Maloideae)

Muhlenbergia (Poaceae) de Chihuahua, México

My Father is the Gardener, Devotions in Botany and Gardening of the Bible

Names for American Acacia (Fabaceae, Mimosoideae)

Nevada Plants: An Annotated Checklist of the State’s Botanical Diversity

Niebla and Vermilacinia (Ramalinaceae) from California and Baja California

Plant Diversity of the Iwokrama Forest, Guyana

Plant Guide: Natural History, Channel Islands, California

Plantas y animales únicos de las islas del Pacifico de Baja California - Unique plants and animals of the Baja California Pacific Islands

Prescribed Grazing

Putting Down Roots: Foundations of Botany at Carolina

Range Plants of North Central Texas

Shinners & Mahler's Illustrated Flora of North Central Texas

Taxonomy, Distribution, and Ecology of the Genus Phaseolus (Leguminosae-Papilionoideae) in North America, Mexico and Central America

Text Annotations and Identification Notes for Manual of the Vascular Flora of the Carolinas

The "El Cielo" Biosphere Reserve, Tamaulipas Mexico: An Annotated Bibliography of the Botanical Literature

The Beauty of Houseplants

The Desert Edge: Flora of Guaymas-Yaqui Region of Sonora, Mexico

The Ecology of our Landscape: The Botany of Where we Live

The Ferns and Lycophytes of Texas

The Genus Mikania (Compositae: Eupatorieae) in Mexico

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

The Genus Psychotria (Rubiaceae) in the Philippine Archipelago