Books by Walter Hepworth Lewis
Airborne and allergenic pollen of North America
Wild American ginseng
Wild American ginseng
Ecology field glossary
Chromosomes and phylogeny of E
Chromosomes and phylogeny of Erythrina (Fabaceae)
Revision of Richardia (Rubiace
Revision of Richardia (Rubiaceae)
Species roses in the United St
Species roses in the United States
Chromosome numbers of phanerog
Chromosome numbers of phanerogams
A monograph of the genus Rosa
A monograph of the genus Rosa in North America east of the Rocky Mountains