Britton Nathaniel Lord

A Preliminary Treatment Of The Opuntioideae Of North America

The Cactaceae: Descriptions And Illustrations Of Plants Of The Cactus Family; Volume 2

An Illustrated Flora Of The Northern United States, Canada And The British Possessions - From Newfoundland To The Parallel Of The Southern Boundary Of Virginla, And From The Atlantic Ocean Westward To The 102d Meridian - Vol 1

The Cactaceae: Descriptions And Illustrations Of Plants Of The Cactus Family; Volume 3

An Illustrated Flora Of The Northern United States And Canada In 3 Volumes