- Leaves alternate, odd-pinnate (rarely mixed with trifoliolate).
- Leaflets opposite and entire.
- Without stipules.
- Turpentine odor.
- Pealing orange and green bark (Bursera).
- Petiolules swollen at base and tip (Protium).
- Flowers small, 4-6-parted, in axillary inflorescences.
- Fruit a capsule with arillate seeds.
Diagnosis: Trees; without stipules, aromatic odors like turpentine, clear or slightly milky latex that dries white, leaves alternate, odd-pinnate, entire, the rachis and petiole often reddish. Bursera has rust and green bark pealing in papery sheets; Protium has petioles swollen at boths ends and the terminal leaflet tipped up.
Local distribution: Pacific slope dry forest (Bursera) and Atlantic slope rain forest (Protium).
Diversity: Total: 2 genera, 5 species. Trees: 2 genera, 5 species.
Comments: Bursera commonly grows on rocky or riparian sites in San Luis and is also frequently used as a living fence post.