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Vachellia collinsii (Fabaceae: Mimosoideae),commonly referred to as the Acacia or Bull Horn or Swollen Thorn Acacia tree due to its former scientific name ‘Acacia collinsii’ (Zuchowski 2007). This species grows along the successional fields, road edges, pasture shrubbery, rocky ridges, and scrub forests from the west coast of Mexico in Guerrero then east to the Yucatán Peninsula, running through Central America and south to Bolivar, Colombia (Seigler and Ebinger 1995). There are certain areas within Costa Rica such as the Guanacaste province, that this plant is commonly encountered, especially in dry areas between sea level -1,000 meters of elevation; they also have a history of growth in the Santa Ana and Central Valley area but are no longer found there (Zuchowski 2007). This flowering plant is pollinated by pollen collecting bees and has it’s seeds dispersed by birds (Janzen 1967). V. collinsii shares a mutualistic relationship with several Pseudomyrmex ant spp., exchanging the following services among many others: ants defend the tree against herbivory while the tree takes care of dietary and shelter needs of the ants (Zuchowski 2007).


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