6. Tribe VII Chlorideae Plants with perfect flowers A. Spikelets with more than 1 perfect floret Inflorescence exerted Spikes more than 1 but few, rachis not prolonged. Eleusine AA. Spikelet with only 1 perfect floret, often with additional imperfect florets above or below. B. Spikelets without additional modified florets, the rachilla sometimes prolonged Rachilla articulate above the glumes, spikes two to many, digitate, rachilla prolonged. Cynodon BB. Spikelets with 1 or more modified florets above the perfect one. Spikelets with no sterile florets below the per- flect one; second glume without a spike. Spikes digitate or nearly so Fertile lemma 1-awned or awnless. Chloris Tribe XII Spikelets all of one kind A. Spikelets sunken in the cavities of the flattened corky rachis. Stenotaphrum AA. Spikelets not sunken in the rachis B. Spikelets subtended or surrounded by 1 to many distinct or more or less comate bristles C. Bristles persistent, the spikelet deciduous Setaria