(2798.) A. arundinacea, Host.; Hook., Fl. II., 241.

Arundo arenaria, Linn.; Michx., Fl. L, 73; Pursh, Fl. I, 87. Psamma littoralis, Beauv. Agrost. 143.

Calamagrostis arenaria, Trin.; Gray, Man. Ed. V., 616; Macoun, Cat. No. 2139.

Apparently a rare grass on sea beaches and on the shores of the Great Lakes. St. John, and Kouchibouguac, N.B. (Fowler, Cat.) Sands of Wellington Beach, Prince Edward Co., Ont.; very abundant on sand at Pic River, Lake Superior. (Macoun.) North shore of Lake Superior. (Agassiz.)

(2799.) A. longifolia, Benth. & Hook. Gen. Plant III., 1153.

Calamagrostis longifolia, Hook., Fl. II., 241; Macoun, Cat. No. 2134.

Very abundant throughout the whole prairie region on sandy ridges, and extending westward to Morley at the base of the Rocky Mountains. (Macoun.) Milk River, north of West Butte, lat. 49. (Dawson.) Souris Plain, Assiniboia. (J. M. Macoun.) Saskatchewan River. (Hooker, Fl.) I place this species with Ammophila, in deference to Bentham and Hooker. Dr. Vasey doubts the correctness of this disposition of it.