1. Eastern North American plant having a terminal cluster of small white flowers and medicinal roots
   - Seneka snakeroot, senga root, senega root, senega snakeroot, Polygala senega

Type of: milkwort

• family Peneidae
• family Pennatulidae
• family Peramelidae
• family Percidae
• family Percophidae
• family Peridiniidae
• family Peripatidae
• family Peripatopsidae
• family Peronosporaceae
• family Pertusariaceae
• family Petromyzontidae
• family Pezizaceae
• family Phaethontidae
• family Phalacrocoracidae
• family Phalangeridae
• family Phalangiidae
• family Phalaropidae
• family Phallaceae
• family Phasianidae
• family Phasmatidae
• family Phasmidae
• family Phillidae
• family Phocidae
• family Phoenicopteridae
• family Phoeniculidae