Digitaria atra is illustrated for the first time and the original descripti
on is emended. The diagnosis of the genus Digitaria is completed by introdu
cing modifications related to the spikelet's morphology and the lower lemma
's consistency. Some remarks about the lower palea are included. The unusua
l morphological characteristics of the spikelet of D. atra are compared wit
h the tribe Isachneae and some genera of Paniceae.