- snapweed
- soboles
- solanella
- sophora
- soredial
- soredium
- smooth-fruited
- spathulate
- soursop
- spermaphyte
- spicebush
- spider-wort
- spiked
- spinula
- spirogyra
- sponge-berry
- starwort
- stigmatiferous
- straight-bodied
- stone-crop
- succiferous
- sugar-apple
- sweet flag
- sweet-bay
- sweet-leaved
- sweet-sap
- taproot
- tentaculate
- tige
- til
- transpiration efficiency
- vertebration
- wellingtonia
- wind-pollinated
- wind-fertilization
- zinziber
- zygophyte