Seed morphology and ultrastructure of eight native shrubs and trees of northeastern Mexico

The morphology and anatomy of the seed testa of eight native tree species f rom northeastern Mexico: Acacia farnesiana, Bumelia celastrina, Condalia ho okerii, Cordia boissieri, Leucaena leucocephala, Parkinsonia aculeata, Pith ecelobium ebano, and, Prosopis glandulosa, was studied. All the testas had one or two layers of long and compact macrosclereid cells arranged like pal isade parenchyma cells. However, the surface characteristics of the testas showed large variability among species.