1. Valuable forage grass of western United States
   - western wheatgrass, bluestem wheatgrass

Type of: wheatgrass, wheat-grass

• genus Portulaca
• genus Portunus
• genus Porzana
• genus Potamogale
• genus Potamogeton
• genus Potamophis
• genus Potentilla
• genus Poterium
• genus Pothos
• genus Potorous
• genus Potos
• genus Pouteria
• genus Praunus
• genus Prenanthes
• genus Presbytes
• genus Priacanthus
• genus Primula
• genus Prinia
• genus Priodontes
• genus Prionace
• genus Prionotus
• genus Pristis
• genus Pritzelago
• genus Proboscidea
• genus Procavia