Taxonomic Revision of the Ant-Acacias (Fabaceae, Mimosoideae, Acacia, Series Gummiferae) of the New World Author David S. Seigler Author John E. Ebinger text Annals of the Missouri Botanical Garden 1995 82 117 138 http://www.jstor.org/stable/2399983 journal article antacacia2399983 http://dx.doi.org/10.2307/2399983 Acacia chiapensis x A. cornigera . Janzen (1967a, 1974) suggested that some of the morphological variation of Acacia chiapensis is probably an expression of the introgression of A. macracantha and A. cornigera genes into the A. chiapensis population. He found hybrids to be common in a permanently wet site below the dam at Temascal, Rio Chichicazapa , and at Arroyo Enmedio , between Temascal, Oaxaca and La Granja , Veracruz, Mexico. On a recent trip ( May 1991 ) to Temascal both A. cornigera and A. chiapensis were common in disturbed sites, but no hybrid individuals were observed.