Bluewood or Logwood Tree
The Bluewood, or Logwood (Condalia obovata, Hook.), grows in thickets in the valley of the Rio Grande River in Texas and is especially esteemed as fuel. It burns with an unusually fervent heat. Its leaves are dry and leathery, obovate, entire, and scarcely an inch long. Its twigs end in sharp thorns. The sweet berries ripen, turning blue, then black, during the long summer. The wood is red, but yields a bluish dye.
It is an entirely different tree from the logwood of commerce, Haema-toxylon Campechianum, which grows in Central America and the West Indies and yields a colouring matter used in calico printing and in the preparation of lake pigments.