Walter H. Lewis

An ecological vocabulary for the Flora North America program / 1971
Chromosomes and phylogeny of Erythrina (Fabaceae) / 1974
Medical botany : plants affecting man's health / 1977
Ecology field glossary : a naturalist's vocabulary / 1977
Wild American ginseng / 1978
Polyploidy, biological relevance : … / 1979
American ginseng : a forest crop / 1980
Airborne and allergenic pollen of North America / 1983
Tropical to warm temperate aerospora of vascular plants / 1990-
Medical botany : plants affecting human health / 2003