Dictionary:

bumelia

  (byū-mē'lē-ə)

Any of various often thorny North American trees or shrubs of the genus Bumelia, especially B. lanuginosa or B. lycioides of the southern United States, having very hard wood and black fleshy fruit. Also called buckthorn, shittimwood.

[New Latin Būmelia, genus name, from Latin būmelia, ash tree, from Greek boumeliā : bous, cow + meliā, ash.]

The noun has one meaning:

Meaning #1: deciduous or evergreen American shrubs small trees having very hard wood and milky latex
  Synonym: genus Bumelia