- sand devil's claw
- spurge nettle
- salpiglossis
- sneezeweed
- squirrel corn
- stonecress
- sea kale
- silver dollar
- samphire
- Scutellaria lateriflora
- Satureja douglasii
- strawberry
- skullcap
- satinpod
- shoo fly
- savory
- stone parsley
- stapelia
- satin flower
- Smyrnium olusatrum
- Swertia speciosa
- sea cole
- Satureja acinos
- stinking nightshade
- Strelitzia reginae
- stone cress
- Satureja vulgaris
- stinking horehound
- sweet false chamomile
- Saussurea costus
- sea milkwort
- Salicornia europaea
- salsify
- stevia
- spiderflower
- succory
- Silybum marianum
- Sesamum indicum
- Sison amomum
- stickweed
- Stachys palustris
- Scopolia carniolica
- sweet coltsfoot
- scentless camomile
- sweet cicely
- suksdorfia
- Senna marilandica
- snakeroot
- sour grass
- self_heal
