Urban Tree Key / Leaves simple / Opposite or Whorled / Opposite / <6″ wide / Pinnately veined / Eucalypts / Bark rough / Leaves bluish / Alternate / >3/4″ wideIs the bark dark brown to black or light brown?Bark dark brown to black, very rough and deeply furrowedRed Iron Bark (Eucalyptus sideroxylon)Bark light brown or gray, and scraggly