It sterile florets are barren , oblong , growing in a clump .
Are 4.5 -- 6.5 millimetres ( 0.18 -- 0.26 in ) long .
It sterile florets are barren , oblong , growing in a clump and are 4.5 -- 6.5 millimetres ( 0.18 -- 0.26 in ) long .