1. Having two colours or shades

Encyclopedia: Two-tone

• genus Spraguea
• genus Spyeria
• genus Squalus
• genus Squatina
• genus Squilla
• genus Stachys
• genus Stanhopea
• genus Stanleya
• genus Stapelia
• genus Staphylea
• genus Staphylococcus
• genus Staurikosaurus
• genus Steatornis
• genus Steganopus
• genus Stegosaurus
• genus Stelis
• genus Stellaria
• genus Stenocarpus
• genus Stenochlaena
• genus Stenopelmatus
• genus Stenopterygius
• genus Stenotaphrum
• genus Stenotomus
• genus Stenotus
• genus Stentor