(2401.) S. Simplex, Huds.; Macoun, Cat., IV., 70.

In marshes in many parts of Prince Edward Island, 1888; abundant at Agassiz, in the Fraser valley, and at Craigellachie in the Gold Range, B.C. 1889. (Macoun.)

Var. Nuttallii, Engelm.

In marshes at Mount Stewart, Prince Edward Island. 1888. (Macoun.) Mr. Beeby doubtfully refers this specimen here.

Var. acaule, Beeby, MS.

"Stem three inches from crown of root to apex of male spike, female heads 2-3, closely agglomerated, partly hidden by the leaf bases. Leaves erect, rigid, a foot high. (Three times longer than the flower stem.)" (Beeby.) Quite common in ponds and wet spots by the roadside in many parts of Prince Edward Island, especially at Lake Verde, Brackley Point and Winter River. 1888. (Macoun.) I believe this to be a good variety as there was no local reason for the peculiar growth.

Var. longissimum, Fries.

Abundant in still water, Spallumsheen River at Enderby, B.C. (J. M. Macoun.) Common in Griffin Lake in the Gold Range, B.C. (Macoun.) I believe that much of our S. affine belongs here, especially those forms with floating stems and leaves.

(2402.) S. affine, Schnitzlein; Macoun, Cat., IV., 70.

In pools on the mountains at the head of Nicoamen River, B.C. Alt. 6000 feet. 1889. (Dawson.) In a pool on Mount Arrowsmith. Vancouver Island. Alt. 5000 feet. 188?. (Macoun.) This is an alpine form of the species. (Beeby.)

(2404.) S. minimum, Fries.; Macoun, Cat. IV., 70.

In bogs, Methy River, Lat. 56°, N.W.T. 1888. (J. M. Macoun.) Common in ponds at Craigellachie, Gold Range, B.C. 1889. (Macoun.)