McBaine Bur Oak – Columbia, Missouri - Atlas Obscura
Bur grass, Tragus species, and purslane, Portulaca species? Handcoloured woodblock engraving of a botanical illustration from Adam Lonicer's Krauterbuch, or Herbal, Frankfurt, 1557. This from a 17th century pirate edition or atlas
Carbide Bur - Type SF - Round Nose Tree - Aluminum Cut
Burr Holes and Bone Flaps | The Neurosurgical Atlas