Species of Agave L., the New World genus of rosulate leaf succulents, generally take many years to flower. Consequently, new species were historically often described from sterile material, resulting in a situation where fundamental phenological information on many species is often lacking. Although less prevalent today, this situation continues sporadically and for Agave felgeri Gentry, which was described just over 40 years ago, information such as basic flower morphology and flower colour is lacking. Here we rectify this situation by providing an amplified description and illustrations of the species.