Abstract
The taxonomy of the genus Bursera has been traditionally supported by morphological characters such as fruit form, bark and leaves. Nonetheless, leaf architecture, another important source of phylogenetic information, has not been well studied in this group. For this purpose, venation patterns of 30 species of the genus Bursera in Mexico were studied. Clarified leaves allowed finding four types of venation patterns: brochidodromous and eucamptodromous in complex B. simaruba (section Bursera); a cladodromous pattern in fragilis, microphylla and fagaroides groups (herein informally called group Quaxiotea (section Bursera), and semicraspedodromous in section Bullockia species. Only bipinnated species of section Bullockia showed a brochidodromous venation pattern. Furthermore, section Bullockia and complex Simaruba presented reticulate tertiary veins, whereas the group of Quaxiotea species presented a ramified pattern in the tertiary veins and tracheoblasts.
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