1. Very leafy malodorous tropical weedy shrub whose seeds have been used as an adulterant for coffee; sometimes classified in genus Cassia
   - coffee senna, mogdad coffee, styptic weed, stinking weed, Cassia occidentalis

Type of: senna

• genus Streptosolen
• genus Strix
• genus Strobilomyces
• genus Strombus
• genus Strongylodon
• genus Strophanthus
• genus Stropharia
• genus Struthio
• genus Struthiomimus
• genus Strymon
• genus Sturnella
• genus Sturnus
• genus Stylomecon
• genus Stylophorum
• genus Styphelia
• genus Styracosaurus
• genus Styrax
• genus Subularia
• genus Suillus
• genus Suksdorfia
• genus Sula
• genus Sundacarpus
• genus Suricata
• genus Surnia
• genus Sus