1 | Both glumes present, placed side by side and entirely covering the floret |
1' | Lower glume suppressed (except in the terminal spikelet), the upper entirely covering the floret |
2 | Outer keel of the glumes distinctly winged; anthers 0.5-0.8 mm long |
2' | Outer keel of the glumes not winged; anthers 0.5-1 mm long |