Birch - (Rosaceae) - (Betulaceae - no know hazard - but avoid: Black, Cherry,Mahogany and Sweet Birch - keep to: White, grey, broadleaf,silver and common birch) Leaves and bark contain salicylates and a few substances with hemolytic properties (destroy red blood cells). The low concentration of salicylates in birch BARK is unlikely to cause toxicity
This is the rose family, I'm not sure why it's in that sentence.(Rosaceae)