POACEAE (GRAMINEAE)
Stems densly tufted, erect from a stout
sheathed root-stock
Leaf margin smooth
Ligule absent
Spikelets1-flowered
Stem not tufted, erect from a creeping
rhizome
Leaf-margin scanerulous
Ligule present
Spike-lets many flowered
Leaves teret, tips spiny
