| The first glume is lanceolate, acute, shorter than the second, with a keel which is scabrid. |
| The first glume is small, oblong-ovate or oblong, 1-nerved with a scabrid keel. |
| The first glume is rigidly coriaceous, gradually narrowed from a villous base to an erect scabrid awn, 1-nerved. |
| The second glume is lanceolate, acuminate, equal to or a little longer than the third glume with a scabrid keel. |
| Leaves narrower, flat, tending to roll up, scabrid above and hairy beneath. |
| The first glume is oblong-lanceolate, 5-nerved, pitted above the middle, with recurved margins and scabrid keels and nerves. |
