Taxonomic Revision of the Ant-Acacias (Fabaceae, Mimosoideae, Acacia, Series Gummiferae) of the New World David S. Seigler John E. Ebinger Annals of the Missouri Botanical Garden 1995 82 117 138 Magnoliopsida Fabaceae Acacia Plantae Fabales 19 136 Tracheophyta species cornigera? × pennatula  Representative specimen. MEXICO. Veracruz: 24.3 mi. from Veracruz on hwy. 140, Seigler et al. 12224 ( ILL).  The wide-ranging ant-acacia Acacia cornigeramay rarely hybridize with the non-ant-acacia A. pennatula. The only specimen seen of this probable hybrid was a 2-m-tall sapling collected in a pasture where both parent species were common. The only other acacia species present was Acacia macracantha. The dense pubescence of this hybrid, however, suggests that A. pennatulais the non-ant-acacia parent. Not only are the twigs and spines densely puberulent, but the leaflets are lightly puberulent and ciliate, while the columnar rachis glands with a depressed apex are similar to those found in A. pennatula. The enlarged spines, the presence of Beltian bodies on the lower 1-2 leaflets of some pinnae, and the well-developed rachis and petiolar glands indicate a relationship to an ant-acacia species. Because A. cornigerais the only ant-acacia known to occur in this part of Mexico, it is probably the ant-acacia parent. However, the relatively small leaflets generally lack secondary veins, and the petiolar glands differ from the canoe-shaped glands of typical A. cornigera. Final determination must await flowering and fruiting material ( Ebinger & Seigler, 1992). 923902278 ILL Seigler et al. Mexico 24.3 mi. from Veracruz on hwy. 140 19 136 12224 1 Veracruz