The Collaborative International Dictionary of English v.0.48:

Haematoxylon \H[ae]m`a*tox"y*lon\ (-l[o^]n), n. [NL., fr. Gr.
   a"i^ma blood + xy`lon wood.] (Bot.)
   A genus of leguminous plants containing but a single species,
   the Haematoxylon Campechianum or logwood tree, native in
   Yucatan.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Haematoxylon
    n 1: small genus of tropical American spiny bushy shrubs or
         trees [syn: Haematoxylum, genus Haematoxylum,
         Haematoxylon, genus Haematoxylon]