The Collaborative International Dictionary of English v.0.48:

Logwood \Log"wood`\n. [So called from being imported in logs.]
   The heartwood of a tree (H[ae]matoxylon Campechianum), a
   native of South America, It is a red, heavy wood, containing
   a crystalline substance called h[ae]matoxylin, and is used
   largely in dyeing. An extract from this wood is used in
   medicine as an astringent. Also called Campeachy wood, and
   bloodwood.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bloodwood \Blood"wood\, n. (Bot.)
   A tree having the wood or the sap of the color of blood.
   [1913 Webster]

   Note: Norfolk Island bloodwood is a euphorbiaceous tree
         (Baloghia lucida), from which the sap is collected
         for use as a plant. Various other trees have the name,
         chiefly on account of the color of the wood, as
         Gordonia H[ae]matoxylon of Jamaica, and several
         species of Australian Eucalyptus; also the true
         logwood ( H[ae]matoxylon campechianum).
         [1913 Webster]