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| Rocky Mountain Wild Flowers | Prosild, A.E. | Wildflowers |
| Rocky Mountain Wildflowers (Colorado Mountain Club Pack Guide) | Ells, J. | Wildflowers |
| Rocky Mountain Wildflowers - Pocket Guide | Dahms, D. | Wildflowers |
| Rodale's Illustrated Encyclopedia of Perennials:10th Anniversary Revised and Expanded Edition | Phillips, E. Burrell, C. C. | Gardening |
| Root Book: How to Plant Wildflowers | Phillips, N. | Wildflowers
Gardening |
| Sagebrush Ocean: A Natural History of the Great Basin | Trimble, S. | Natural History |
| Salt Tide: Cycles and Currents of Life Along the Mid-Atlantic Coast | Badger, C. J. | Natural History |
| San Diego County Native Plants | Lightner, J. | Plant Identification |
| Science of Herbal Medicine: Pharmacological, Medical, Historical, Anthropological | Heinerman, J. | Useful Plants
Medicinal Plants |
| Scrub Plant Guide: A Pocket Guide to the Common Plants of Southern Florida's Scrub Community | Austin, Daniel; Penelope Honychurch; Steve Bass | Plant Identification |
| Seashore Plants of South Florida and the Caribbean | Nellis, David W. | Gardening
Landscaping
Natural History
Useful Plants |
| Secrets of Plant Propagation : Starting Your Own Flowers, Vegetables, Fruits, Berries, Shrubs, Trees, and Houseplants | Hill, L. | Plant Propagation |
| Secrets to Great Soil | Stell, Elizabeth | Gardening |
| Seed Propagation of Native California Plants | Emery, D.E. | Plant Propagation |
| Seeds: The Definitive Guide to Growing, History, and Lore | Loewer, H. P. | Plant Propagation |
| Seeds: The Ultimate Guide to Growing Successfully from Seed | McVicar, J. | Plant Propagation |
| Seeds: Time Capusles of Life | Kesseler, R.; Stuppy, W. | Plant Propagation |
| Selected California Native Plants With Commercial Sources | Saratoga Horticultural Foundation | Landscaping
Gardening |
| Sensitivae censitae : a description of the genus Mimosa Linnaeus (Mimosaceae) in the New World | Barneby, Rupert C. | Mimosa spp. |
| Shinners & Mahler's Illustrated Flora of North Central Texas | Diggs, G. M.; B. L. Lipscomb; B. O'Kennon; W. F. Mahler; L. H. Shinners | Plant Identification |
| Shrubs & Trees of the Southwest Deserts | Bowers, J. and Wignall, B. | Plant Identification |
| Shrubs and Trees of the Southwest Uplands | Elmore, F.H. | Plant Identification |
| Shrubs and Woody Vines of Florida (The): A Reference and Field Guide | Nelson, Gil | Plant Identification |
| Shrubs of the Great Basin: A Natural History | Mozingo, H.N. | Plant Identification |
| Sierra Nevada Flora | Weeden, N.F. | Plant Identification |
| Sierra Nevada Natural History | Storer, T. I. ; R. L. Usinger; D. Lukas | Natural History |
| Sierra Nevada Natural History: Revised Edition (California Natural History Guides) | Storer, T. I. | Wildlife |
| Sierra Nevada wildflowers | Horn, E. L. | Wildflowers |
| Sierra Nevada Wildflowers, 2nd: A Field Guide to Common Wildflowers and Shrubs of the Sierra Nevada, including Yosemite, Sequoia, and Kings Canyon National Parks (Wildflower Series) (2nd Edition) | Wiese, K. | Wildflowers |
| Sierra Nevada Wildflowers: a field guide to common wildflowers and shrubs of the Sierra Nevada, including Yosemite, Sequoia, and Kings Canyon National Parks | Wiese, K. | Wildflowers
Plant Identification |
| Silvics of North America (Agriculture Handbook 654) | Burns, Russell M. and Barbara H Honkala | Natural History |
| Smartgarden Regional Guide: Southeast (American Horticultural Society Smartgarden Regional Garden Guides) | Barrick, W. E. and Pelczar, R. | Gardening |
| Smithsonian Guide to Seaside Plants of the Gulf and Atlantic Coasts from Louisiana to Massachusetts, Exclusive of Lower Peninsular Florida | Duncan, W. H.; uncan, M. B. | Plant Identification |
| So You Want to Start a Nursery | Avent, T | Landscaping |
| Some Edible Mushrooms and How To Cook Them | Faubion, N. L. | Edible Plants |
| Some Natural Violet Hybrids of North America | Brainerd, Ezra | Wildflowers |
| Sonoran Desert wildflowers | Spellenberg, R. | Wildflowers |
| South Carolina Naturalists: An Anthology, 1700-1860 | Taylor, D. | Natural History |
| South Carolina Wildflowers | Midgley, J.W. | Wildflowers |
| South Texas wildflowers : collection one | Ham, H. | Wildflowers |
| Southeastern Wildflowers | Midgley, J. W. | Gardening
Plant Propagation
Wildflowers |
| Southern Appalachian Wildflowers | Medina, B. F.; V. Medina | Wildflowers |
| Southern California Native Plants for School Gardens | Landis, B. | Gardening
Landscaping |
| Southern Fruit & Vegetable Gardening: How to Plant, Grow, and Harvest the Best Edibles - Alabama, Arkansas, Georgia, Kentucky, Louisiana, Mississippi, ... (Fruit & Vegetable Gardening Guides) | Elzer-Peters, K. | Gardening |
| Southern Rocky Mountain Wildflowers: Including Rocky Mountain National Park (Wildflower Series) (1st Edition) | Robertson, L. | Plant Identification
Wildflowers |
| Southern Wildflowers | Parker, L. | Wildflowers |
| Southwestern Landscaping with Native Plants | Phillips, J. | Landscaping
Gardening |
| Spring flora of Central Oklahoma | Goodman, G. J. | Plant Identification |
| Spring Flora of Minnesota: Including Common Cultivated Plants | Morley, T. | Plant Identification |
| Spring Flora of Wisconsin : A Manual of Plants Growing without Cultivation and Flowering Before June 15 | Fassett, N. C.; O. S. Thomson | Plant Identification |
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