Panicum philadelphicum subsp. gattingeri
Plants slender to robust. Culms to 100 cm, often spreading to decumbent and rooting at the lower nodes, branching freely distally. Blades 5-12 mm wide, spreading, those of the flag leaves usually more than 1/3 as long as the panicles. Panicles about 1/2 as long as the plant, exserted; secondary branches divergent; pedicels divergent, flexible, scabrous. Spikelets 1.9-2.4 mm. Upper glumes and lower lemmas acuminate, straight; upper florets about 1/2 as wide as long, stramineous, not disarticulating.