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- Sea anemones (1)
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- Sedge (29)
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- Selaginella acanthonota (2)
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- Selaginella (6)
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- Sequoia gigantea (20)
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- Seven Angle Pipewort (1)
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- Shantz, H. L. (Homer Leroy), 1876-1958 (2)
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- Sharp, William Graves, 1859-1922 (2)
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- Shorelines -- New York (State) (3)
- Shorelines (127)
- Short Leaf Pine (9)
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- Shull, George Harrison, 1874-1954 (1)
- Shumards Oak (2)
- Siebert, F. (1)
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- Silphium laciniatum (4)
- Silphium perfoliatum (1)
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- Silphium (9)
- Silt (19)
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- Skottsberg, Carl, 1880-1963 (2)
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- Sleeping Bear Dunes National Lakeshore (23)
- Sleeping Bear Dunes (23)
- Sleeping Bear Point (7)
- The Sleeping Bear (23)
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- Slopes (Physical Geography) (55)
- Slough 14 (3)
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- Slough 1 (2)
- Slough 29 (1)
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- Slough 58 (1)
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- Slough 7 (1)
- Slough 8 (2)
- Slough 90 (3)
- Slough 93 (5)
- Slough 95 (2)
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- Small Fruit Cactus (1)
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- Smith, Joseph, 1805-1844 (1)
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