Evegnii Borisovich Alexeev (also spelt Yevgeni Alekseyev) was a Russian agrostologist. During his short lifetime he identified 250 new species of grass, though not all his taxa have been accepted. In particular, in the 1980s he published a series of works looking at the genus Festuca around the world, which appeared in a number of Russian botanical journals.

Sources:
S.J. Darbyshire, 2007, "Contributions to the Genus Festuca (Poaceae: Poeae) in Mexico and a Key to the Central American Species", Journal of the Botanical Research Institute of Texas, 1(2): 826-828
I.A. Gubanov, K.V. Kiselyeva, V.S. Novikov, 1988, "Dr E.B. Alexeev's Contribution to Agrostology", Byulletin Moskovskogo Obschestva Ispyt. Prirody, Otd. Biologii, 93(5): 117-125
V.N. Tikhomirov, 1988, "To the Memory of Eugeniy Borisovich Alexeev (13 May 1946 - 2 April 1987)", Byulletin Moskovskogo Obschestva Ispyt. Prirody, Otd. Biologii, 93(5): 115-117.