[en] Agaves of Continental North America

[en] Alpine Plants of North America: An Encyclopedia of Mountain Flowers from the Rockies to Alaska

[en] Armitage's Native Plants for North American Gardens

[en] Gardens of North Carolina: A Traveler's Guide

[en] Lives of Conifers: A comparative account of the coniferous trees indigenous to Northeastern North Am

[en] Native Trees for North American Landscapes

[en] Orchids of Europe, North Africa and the Middle East

[en] Wild Orchids Across North America