The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 1

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 1

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 2

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 2

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volumes 3-4

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 2

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 2

The Genus Cereus and Its Allies in North America

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 1

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 3

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 3

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 3

A Preliminary Treatment of the Opuntioideae of North America

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 1

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 2

The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family, Volume 4

Miscellaneous Papers

Catalogue of Plants Found in New Jersey

Catalogue of Plants Found in New Jersey

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 3