Richard Spellenberg

• Trees of Eastern North America
• National Audubon Society field guide to North American wildflowers, western region
• New Mexico Vegetation
• Sonoran Desert Wildflowers
• The Audubon Society field guide to North American wildflowers, western region
• Trees of Eastern North America (Princeton Field Guides)
• Audubon Wild Flwrs-West
• Sonoran Desert wildflowers
• Sonoran Desert Wildflowers, 2nd
• Sonoran Desert Wildflowers: A Guide To Common Plants (Wildflower Series)
• The sunflower family
• Trees of Western North America