Ryegrasses, 29
Rytilix, 27

Sabal, 45
Sabina, 18
Saccharum, 34
Sacciolepis, 34
Sagittaria, 20
Sago-palm Family, 17
Sago Pondweed, 19
St. Augustine Grass, 36
Salpingostylis, 56
Saltgrass, 26
Salt-marsh Bulrush, 44
Saltmarsh Cordgrass, 35
Saltmeadow Cordgrass, 35
Salvinia, 17
Salviniaceae, 17
Sandgrass, 36
Sand Pine, 17
Sandspurs, 24
Sansevieria, 55
Sawgrass, 39
Saw Palmetto, 46
Schizachyrium, 34
Schizaea, 12
Schizaeaceae, 12
Schoenocaulon, 52
Schoenolirion, 52
Scirpus, 44
Scirpus, 41
Scleria, 45
Scleropoa, 34
Scouring-rush, 11
Scrub Blue-eyed-grass, 56
Scrub Palmetto, 45
Sea-grasses, 21
Sea Oats, 37
Sedge Family, 37
Sedges, 37
Selaginella, 10
Selaginellaceae, 10
Sensitive Fern, 14
Serenoa, 46
Serpent Ferns, 14
Setaria, 34
Shadow-witch, 61
Shell-flower, 57
Shield Ferns, 14
Shoestring Fern, 16
Shore Rush, 50
Shortleaf Pine, 17


Signalgrasses, 23
Silver Fern, 15
Silver Ferns, 15
Silver Hairgrass, 21
Silver Palm, 45
Silver Plumegrass, 27
Sisal Hemp, 54
Sisyrinchium, 56
Six-weeks Fescue, 27
Slash Pine, 18
Slender Crabgrass, 25
Slender Wedgegrass, 35
Small Cane, 28
Smilax, 52
Smutgrass, 36
Snowy Orchid, 60
Soft Rush, 50
Solomon's-seal, 52
Sorghastrum, 35
Sorghum, 35
Sorghum, 35
Southern Cattail, 18
Southern Cutgrass, 28
Southern Naiad, 20
Southern Pickerelweed, 50
Southern Red-cedar, 18
Southern Sandspur, 24
Southern Wild-rice, 37
Spanish Bayonet, 55
Spanish Dagger, 55
Spanish-moss, 49
Sparganiaceae, 19
Sparganium, 19
Spartina, 35
Spathiger, 59
Sphenomeris, 15
Sphenopholis, 35
Sphenopsida, 11
Spenostigma, 56
Spider-lilies, 54
Spider Orchid, 58
Spiderwort Family, 49
Spiderworts, 49
Spikemosses, 10
Spikemoss Family, 10
Spike-rushes, 41
Spiranthes, 61
Spirodela, 46
Spleenworts, 13
Spoon-flower, 46
Sporobolus, 35
Sprangletops, 28