The Cactaceae

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family

An Illustrated Flora of the Northern United States, Canada and the British Possessions

Amaranthaceae to Loganiaceae; amaranth to polypremum

A Preliminary Treatment of the Opuntioideae of North America

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

An Illustrated Flora of the Northern United States, Canada and the British Possessions From Newfoundland to the Parallel of the Southern Boundary of Virginia, and From the Atlantic Ocean Westward to the 102d Meridian 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 Virginia, and From the Atlantic Ocean Westward to the 102d Meridian; Index