PANICUM ELONGATUM Pursh.
The longer and acuminate spikelets serve well to distinguish this from P. agrostoicles Muhl. Another equally important and so far constant character is the distinct stalk to the scale of the per fect flower. In P. agrostoides the fourth scale is sessile, or nearly so, and much broader in proportion to its length.
Dr. Geo. Vasey (Contr. U. S. Nat. Herb. 3: 33, 1892) noted this feature in what he considered an eastern form of P. agros toides Spreng., and which is presumably the plant now known as P.