The Hunter-Gatherer Within: Health and the Natural Human Diet

The Mosses of Madre de Dios, Peru

The Mosses of Texas: A Manual of the Moss Flora with Sketches

The Sunflower Family: A Guide to the Family Asteraceae in the Contiguous United States

Trees in the Life of the Maya World

Tundra to Tropics: The Floristic Plant Geography of North America

Violets (Viola) of Central and Eastern United States: An Introductory Survey

Wild Flowers of Mombacho (Nicaragua)

Wild Flowers of the Canary Islands