Elephant Trees
- Information and photographs of these trees with swollen trunks, adapted for desert life, Bursera microphylla and Pachycormus discolor.
- http://www.biology.ed.ac.uk/research/groups/jdeacon/desertecology/elephant.htm#top

Bursera simaruba
- Description of this species, with photographs of the tree, leaves, shoots, fruit and bark.
- http://www.cybertruffle.org.uk/vinales/eng/bursera_simaruba_ok.htm

Bursera shaferi
- Description of this species, with photographs of the tree, shoots, leaves and bark.
- http://www.cybertruffle.org.uk/vinales/eng/bursera_shaferi.htm

Bursera fagaroides
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- http://florawww.eeb.uconn.edu/acc_num/198800096.html

Bursera microphylla
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- http://florawww.eeb.uconn.edu/acc_num/198502785.html

Bursera hindsiana
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- http://florawww.eeb.uconn.edu/acc_num/199200143.html