1. Curved backward or inward
   - recurved

See also: curved, curving

• genus Sparmannia
• genus Spartina
• genus Spartium
• genus Spathiphyllum
• genus Spergula
• genus Spergularia
• genus Spermophilus
• genus Sphacele
• genus Sphacelotheca
• genus Sphaeralcea
• genus Sphaerocarpos
• genus Sphaerocarpus
• genus Sphagnum
• genus Sphecius
• genus Sphecotheres
• genus Spheniscus
• genus Sphenodon
• genus Sphyraena
• genus Sphyrapicus
• genus Sphyrna
• genus Spilogale
• genus Spinacia
• genus Spinus
• genus Spiraea
• genus Spiranthes