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Key to Poaceae, Key D: rattail or cob grasses

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1 All spikelets unisexual, the pistillate and staminate spikelets either in separate inflorescences, or the pistillate spikelets below the staminate spikelets in the same inflorescence; leaves 9-120 mm wide; [tribe Andropogoneae].
..2 Pistillate spikelets below the staminate in the same inflorescence
..2 Pistillate and staminate spikelets in separate inflorescences, the pistillate inflorescences axillary, staminate inflorescences terminal
 Zea
1 Some spikelets bisexual; leaves 1-25 mm wide.
....3 Spikelets with 2-7 florets, the lower bisexual and fertile, the upper sometimes sterile; [tribe Triticeae]
....3 Spikelets with at most 2 florets, the lower staminate or sterile, the upper bisexual, staminate, or sterile.
......4 Culms 2-45 cm tall; leaves 1-6 mm wide; plants annual (perennial in Eremochloa and Stenotaphrum).
........5 Plants obviously and prominently rhizomatous (Eremochloa) or stoloniferous (Stenotaphrum); lower glume with pectinate margins (Eremochloa) or irregularly toothed (Stenotaphrum)
..........6 Plant rhizomatous; lower glume with pectinate margins; [commonly naturalized turf grass and roadside weed]; [tribe Andropogoneae]
..........6 Plant stoloniferous; lower glume irregularly toothed; [naturalized turf grass and allegedly also native]; [tribe Paniceae]
........5 Plants annual; lower glume with smooth and cartilaginous margins (or absent); [rare waifs]; [tribe Poeae].
............ 7 Spikelets with 1(-2) glume
............ 7 Spikelets with 2 glumes
......4 Culms 30-400 cm tall; leaves 2-25 mm wide; plants annual or perennial; [tribe Andropogoneae].
............ ..8 Lower glumes of the sessile spikelets rough, rugose, pitted, tuberculate or alveolate between the keels
............ ..8 Lower glumes of the sessile spikelets smooth or scabrous.
............ ....9 Pedicels at least partially fused to the rame axes
............ ......10 Sheaths mostly glabrous (sparsely ciliate towards the base); plants perennial
............ ......10 Sheaths with stiff, papillose-based hairs 1-3 mm long; plants annual
............ ....9 Pedicels appressed, but not fused, to the rame axes.
............ ........11 Pedicellate spikelets 4-8 mm long
............ ........11 Pedicellate spikelets 1-3 mm long
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