1. A numbered main or principal road

Encyclopedia: A road

• genus Sericocarpus
• genus Serinus
• genus Seriola
• genus Seriphidium
• genus Seriphus
• genus Serranus
• genus Serrasalmus
• genus Serratia
• genus Serratula
• genus Sertularia
• genus Sesamum
• genus Sesbania
• genus Seseli
• genus Setaria
• genus Setophaga
• genus Shigella
• genus Shorea
• genus Shortia
• genus Sialia
• genus Sialis
• genus Sida
• genus Sidalcea
• genus Sideritis
• genus Sigmodon
• genus Silene