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| The Secrets of Wildflowers: A Delightful Feast of Little-Known Facts, Folklore, and History | Jack Sanders | Wildflowers |
| The Southeastern Indians | Hudson, Charles | Useful Plants |
| The Southern Living Garden Book: Completely Revised (Second Edition) | Editors of Southern Living Magazine | Gardening |
| The State Botanical Garden of Georgia | Nourse, H. & Nourse, C. | Plant Identification |
| The Sunflower Family in the Upper Midwest: A Photographic Guide to the Asteraceae in Illinois, Indiana, Iowa, Michigan, Minnesota, and Wisconsin | Antonio, T. M. and Masi, S. | Wildflowers |
| The Tallgrass Prairie Center Guide to Seed and Seedling Identification in the Upper Midwest (Bur Oak Guide) | Butler, B. and Williams, D. | Plant Identification |
| The Texas Bluebonnet | Andrews, J. | Wildflowers |
| The Useful Wild Plants of Texas, the Southeastern and Southwestern United States, the Southern Plains, and Northern Mexico, Vol. 1: Abronia-Arundo | Cheatham, S.; Johnston, M.C.; Marshall, L. | Useful Plants |
| The Wild Orchids of Arizona and New Mexico (Comstock books) | Coleman, R. A. | Plant Identification |
| The Wildflower Book: East of the Rockies - A Complete Guide to Growing and Identifying Wildflowers (Stokes Backyard Nature Books) | Stokes, D., Stokes, L. | Wildflowers |
| The Wildflower Gardener's Guide: Midwest, Great Plains, and Canadian Prairies Edition | Art, H. W. | Wildflowers |
| The Wildflower Gardener's Guide: Northeast, Mid-Atlantic, Great Lakes, and Eastern Canada Edition | Art, H. W. | Wildflowers |
| The Wildflowers of Mount Adams, Washington | McDougall, S. | Plant Identification
Wildflowers |
| The Wildlife Gardener's Guide | Marinelli, Janet | Wildlife |
| Thirty Poisonous Plants of North America | Chesnut, V. K. | Poisonous Plants |
| This Fragile Land: A Natural History of the Nebraska Sandhills | Johnsgard, P.A. | Natural History |
| This Land : A Guide to Central National Forests | Mohlenbrock, R. H. | Natural History
Plant Identification |
| This Land : A Guide to Eastern National Forests | Mohlenbrock, R. H. | Natural History
Plant Identification |
| This Land : A Guide to Western National Forests | Mohlenbrock, R. H. | Natural History
Plant Identification |
| Thoreau's Garden: Native Plants for the American Landscape | Loewer, H. P. | Gardening
Natural History |
| Tom Brown's Guide to Wild Edible and Medicinal Plants (Field Guide) | Brown, T. | Wildflowers |
| Tough Plants for Southern Gardens | Rushing, F. | Gardening
Landscaping |
| Tough-as-Nails Flowers for the South | Winter, N. | Gardening |
| Toxic Plants | Kinghorn, A.D. | Poisonous Plants |
| Toxic Plants Dangerous to Humans and Animals | Bruneton, J. | Poisonous Plants |
| Toxic Plants of North America | Burrows, G. E.; R. J. Tyrl | Poisonous Plants |
| Toxic Plants of Texas: Integrated Management Strategies to Prevent Livestock Losses | Hart, C. R. | Poisonous Plants |
| Traditional Plant Foods of Canadian Indigenous Peoples: Nutrition, Botany, and Use | Kuhnlein, H., & J. Turner | Edible Plants |
| Trees and Other Woody Plants of Maine | Hyland, F. & F.H. Steinmetz | Plant Identification |
| Trees and Shrubs for Dry California Landscapes: Plants for Water Conservation | Perry, B. | Landscaping |
| Trees and Shrubs for Pacific Northwest Gardens | Grant, J.A. & C.L. Grant | Landscaping |
| Trees and Shrubs for the Northern Plains | Hoag, D.G. | Plant Identification |
| Trees and Shrubs of Colorado | Carter, J.L. | Plant Identification |
| Trees and Shrubs of Kentucky | Wharton, M. E.; R. W. Barbour | Plant Identification |
| Trees and Shrubs of Minnesota | Smith, W. R. | Plant Identification |
| Trees and Shrubs of New England | Dwelley, M.J. | Plant Identification |
| Trees and Shrubs of New Mexico | Carter, J.L. | Plant Identification |
| Trees and Shrubs of the Southeast | Dean, B. | Plant Identification |
| Trees and Shrubs of the Southwestern Deserts | Benson, L. D. | Plant Identification |
| Trees and Shrubs of the Trans-Pecos and Adjacent Areas | Powell, A. M. | Plant Identification |
| Trees and Shrubs of the Upper Midwest | Roendahl, C. O. | Plant Identification |
| Trees and Shrubs of Virginia | Gupton, O. W. & F. C. Swope | Plant Identification |
| Trees and Shrubs of Washington | Lyons, C.P. | Plant Identification |
| Trees and shrubs: illustrations of new or little known ligneous plants, prepared chiefly from material at the Arnold Arboreum of Harvard University | Sargent, C. S. | |
| Trees in Canada | Farrar, John L. | Plant Identification |
| Trees of Central Florida | Lakela, O.; Wunderlin, Richard P. | Natural History
Plant Identification |
| Trees of Central Texas | Vines, Robert A. | Plant Identification |
| Trees of Florida (The): A Reference and Field Guide | Nelson, Gil | Plant Identification |
| Trees of Georgia and Adjacent States | Brown, C.L. & L.K. Kirkman. | Plant Identification |
| Trees of Minnesota: Field Guide | Tekiela, S. | Plant Identification |
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