1 | Glumes 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. |
2 | Nut 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 |