Ungnadia
 Ungnadia speciosa the Mexican Buckeye is a shrub or small tree native to northern Mexico as well as Texas and southern New Mexico in the United States. It is monotypic the only species in the genus Ungnadia. The name honours Christian Samuel Baron von Ungnad (d. 1804).It differs from the buckeyes in the related genus Aesculus in having alternate pinnate leaves with 5-7 leaflets but the flowers and nuts are similar. Another similar related genus is the soapberry (genus Sapindus).