KEY TO THE SPECIES

1Glumes muticous, acute. Inflorescence anthelate, open, rarely reduced to a single spikelet. Nut minutely granular, obsoletely transversely wrinkled
1'Glumes mucronulate, the mucro finally excurved. Inflorescence capitate or, if anthelate, congested. Nut either smooth or distinctly transversely wrinkled.
2Nut smooth, minutely reticulate by the isodiametric epidermal cells, ½-¾ mm long. Glumes glabrous, or but slightly pubescent
2'Nut distinctly transversely wrinkled, with longitudinally oblong-linear epidermal cells, ¾-1 mm long. Glumes rather densely pubescent