Source : Webster's Revised Unabridged Dictionary (1913)

Oswego tea \Os*we"go tea"\ (Bot.)
   An American aromatic herb ({Monarda didyma}), with showy,
   bright red, labiate flowers.

Source : WordNet®

Monarda didyma
     n : perennial aromatic herb of eastern North America having
         variously colored tubular flowers in dense showy heads
         [syn: {bee balm}, {beebalm}, {bergamot mint}, {oswego tea}]