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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 |
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 |