Key to Tasmanian Dicots
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Setaria (Poaceae) 4b:341
Tasmania has five introduced species of Setaria(pigeon grasses). Some of these are reasonably common weed species. The inflorescence is a quite compact, more-or-less cylindrical structure. The very distinctive feature of these grasses is that each spikelet has one to four bristles beneath it. In some species (especially Whorled Pigeon Grass, S. verticillata) these catch in hair and clothing. The spikelets are small, have two florets (the upper one with stamens and an ovary, the lower sterile) and lack awns/
 

 
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