| Solanum wendlandii |
Giant Potato Vine |
| Solenopsis |
Orange Thief Ant |
| Sonchus asper |
Spiny Sow Thistle |
| Sonchus oleraceus |
Smooth Saw-Thistle; Annual Sow Thistle; Common Sow Thistle |
| Sorbaria tomentosa |
Kashmir False Spiraea; Himalayan Sorbaria |
| Sorghum bicolor |
Guinea Corn; Sorghum |
| Sorghum halepense |
Johnson Grass; Johnsongrass |
| Spalangia |
|
| Spanagonicus albofasciatus |
Whitemarked Fleahopper; |
| Spathelia simplex |
Pride of the Mountain |
| Spathiphyllum wallisii |
Peace Lily |
| Spathodea campanulata |
Flame of the Forest; African Tulip Tree |
| Spermacoce tenuior |
Slender Buttonweed |
| Spermacoce tetraquetra |
Hairy Spermacoce |
| Sphagneticola trilobata |
Seaside Creeping Daisy |
| Sphenopholis obtusata |
Prairie Wedge Grass |
| Sphenophorus venatus vestitus |
|
| Sphyrocoris obliquus |
|
| Spilochalcis |
|
| Spinilimosina brevicostata |
|
| Spiraea cantoniensis |
Chinese Spiraea; White Spiraea; White Spirea |
| Spiraea prunifolia |
Bridal Wreath Spiraea |
| Spiraea salicifolia |
Bridewort; Bridewort; Willowleaf Meadowsweet |
| Spissistilus festina |
|
| Spondias mombin |
Hog Plum; Mombin |
| Spondias purpurea |
Spanish Plum |
| Spongia hispida |
|
| Sporobolus junceus |
|
| Sprekelia formosissima |
Aztec Lily; Jacobean Lily |
| Stachys arvensis |
Field Woundwort; Wound Wort; Staggerweed; Hedge Nettle |
