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1 Spikelets 2.4-4.5 mm long. |
2 Nodes, internodes, and sheaths glabrous; blades 4-13 cm long, 5-8 mm wide, the surfaces smooth, glabrous; spikelets 2.4-2.9 mm long, glabrous; not known to produce axillary ( autumnal) inflorescences |
2 Nodes bearded or otherwise pubescent; internodes and sheaths variously pubescent to glabrate; blades 6-35 cm long, 2-6 mm wide, one or both surfaces scabrous and often pubescent; spikelets 1.7-4.5 mm long, glabrous or pubescent; plants produce axillary ( autumnal) inflorescences. |
3 Spikelets 2.8-3.8 (-4.5) mm long, the second glume and sterile lemma pointed or beaked and extended beyond the summit of the fertile lemma; first glume 1.2-2 mm long |
3 Spikelets 1.7-2.8 mm long, the second glume and sterile lemma blunt or broadly pointed, not extending beyond the summit of the fertile lemma; first glume 0.7-1.2 mm long |
4 Fresh plants light green to blue-green; leaf sheaths usually pilose; ligule of largest culm leaves 3-6× as wide as long; culm blades to 35 cm long, usually pilose on the upper surface |
4 Fresh plants darker green; leaf sheaths usually glabrous; ligule of largest culm leaves usually > 6× as wide as long; culm blades to 15 cm long, usually glabrate to glabrous on the upper surface |
1 Spikelets 0.9-2.3 mm long. |
5 Longer blades > 6 cm; if only 6 cm, then sheaths, especially the lower, retrorsely long- pilose ( D. laxiflorum). |
6 Spikelets 1.2-1.5 mm long, glabrous |
6 Spikelets (1.4-) 1.7-2.3 (-2.8) mm long, pubescent. |
7 Longer blades 10-35 cm long, 2-6 mm wide; sheaths glabrous to variously pilose, but not conspicuously retrorsely long- pilose; nodes variously pubescent to glabrate; spikelets 1.7-2.3 (-2.8) mm long |
8 Fresh plants light green to blue-green; leaf sheaths usually pilose; ligule of largest culm leaves 3-6× as wide as long; culm blades to 35 cm long, usually pilose on the upper surface |
8 Fresh plants darker green; leaf sheaths usually glabrous; ligule of largest culm leaves usually > 6× as wide as long; culm blades to 15 cm long, usually glabrate to glabrous on the upper surface |
7 Longer blades 6-18 cm long, 7-12 mm wide; sheaths conspicuously retrorsely long- pilose; nodes bearded with retrorse or spreading hairs; spikelets (1.4-) 1.9-2.3 (-2.5) mm long |
5 Longer blades 1.5-6 cm; sheaths glabrous or pubescent, but not retrorsely long- pilose. |
9 Blades 1-3 mm wide, glabrous, eciliate or basally ciliate; spikelets 0.9-1.2 (-1.4) mm long. |
10 Spikelets pubescent, 1.2-1.4 mm long; blades involute, often falcate, 2.5-6 cm long; [ endemic to c. and s. FL scrub] |
10 Spikelets glabrous, 0.9-1.2 mm long; blades flat, not falcate, 1.5-4 (-5) cm long; [wet sites, VA s. to FL, w. to e. LA] |
9 Blades 3-8 mm wide; spikelets 1.1-2.1 mm long (or if < 1.5 mm long, then blades either pubescent on one or both surfaces or ciliate to the apex). |
11 Spikelets pubescent, 1.5-2.1 mm long; blade surfaces glabrous |
11 Spikelets glabrous, 1.1-1.8 mm long; blade surfaces pubescent or glabrous. |
12 Blades glabrous, or sparsely pilose only near the adaxial base; spikelets 1.4-1.8 mm long |
12 Blades pilose, at least abaxially; spikelets 1.1-1.6 mm long |