The fourth glume is very minute, awned and is borne by a rachilla produced to half the length of the third glume.
The caryopsis is very narrow, and the rachilla long and feathered with hairs.
Spikelets are contracted spiciform panicles, 1- to 3-flowered, rachilla is jointed at the base.
rachilla short, flattened and angular, tapering below (see Festuca elatior).
The rachilla is produced beyond the flowering glumes and articulate at the base just above the empty glumes.
Palea very similar to A. fatua, apex 2-4-toothed or bifid, rachilla with stiffer hairs.
In the variety of Chevallier known as Archer, however, the rachilla has somewhat long hairs.
rachilla distinct, smooth, much wrapped in, widens upwards and is somewhat flattened.
In Eriochloa it is reduced to a minute ridge lying just close to the swollen ring-like joint of the rachilla.
The absence of awn, rachilla, and basal hairs distinguishes Agrostis from Aira.