Photo and description from Strictly Medicinal Seeds (www.strictlymedicinalseeds.com).
 
(Toothache Plant, Para Cress, Buzz Buttons, Sansho Buttons, Electric Buttons, Jambu, Szechuan Buttons, Spilanthes acmella, Spilanthes oleracea)  Tropical perennial native to Brazil, grows 18 inches tall, in a mounding form.  Flowers sport the characteristic bright crimson “fisheye” at the apex. Ancient, distinctively beautiful and highly entertaining plant.  Traditional usage (TWM): stimulant, tonic, dentifrice, earache, gum disease, lyme’s disease, and malaria.  Plant prefers full sun and well-manured soil and plenty of water.