Manual of the New Zealand Flora.

Tribe VI. Avenæ

Tribe VI. Avenæ.

Spikelets 2 or several-flowered, usually panicled. Flowering glumes generally shorter than the outer glumes, usually awned; awn geniculate and often twisted, rarely straight.

* Awn of the flowering glumes dorsal, rising from below the terminal teeth of the glume, not from between them.
Spikelets 2-flowered. Flowering glumes erose or 2-toothed at the tip, shortly awned 20. Deschampsia.
Spikelets 2–6-flowered. Flowering glumes sharply 2-toothed at the tip; teeth sometimes almost awned; awn from the back just below the teeth 21. Trisetum.
Spikelets 5–10-flowered. Flowering glumes rounded at the back; awn dorsal, straight or bent 22. Amphibromus.
** Awn of the flowering glumes rising from between the terminal lobes or teeth of the glume.
Spikelets several-flowered. Flowering glumes rounded at the back, often ciliate or hairy; awn rigid, often twisted or flattened at the base 23. Danthonia.