41 
1% inches long, slender, erect, rising from the axils of the branches. 
Spikes 3-4 lines long, ovate, continuous, 5-8 flowered. Fruit 
obliquely obovate, about 1% lines long and 1 line wide, 3-keeled, 
middle keel distinct; face straight or nearly so; sides with a slight 
impression which runs into the face; style short, blunt, nearly 
facial; embryo with the apex pointing a little inside of the base. 
In North American forms the fruit is slightly longer and narrower, 
and the embryo more incurved than in the European plant. 
Rarely producing propagating buds. 
Non-fruiting specimens of P. major are liable to be con- 
founded with this species. For the distinctions see under that 
species. 
Not very common in this country. Ponds and still waters. 
Quebec and Methy River, Lat. 57° N. Canada (Macoun); 
Barton, Vt. (Robbins); Granby, Mass. (Tuckerman); Pleasant 
Pond, Wenham, Mass. (Morong); Worcester and Natick, Mass. 
(Morong); Pine Plains, N. Y. (Hoysradt); Spencer, N. Y. (Dud- 
ley); Easton and Susquehanna River, Pa. (Porter); Lake Superior 
47 Vermilion Lake, Minn. (Г. Н. Bailey); Sherburne 
Geyer Basin, Wyoming (Clifford Richardson) July-August 
(Plate XLVIII.) 
25. POTAMOGETON MAJOR (Fries) Morong. 
P. pusilllus L. var. major, Fries, Nov. 48 (1828). 
P. Friesii, Ruprecht in Beit. Pf. de Russ. R. iv. 43 (1845). 
P. compressus, Sm. Eng. Bot. iii. t. 418 (1794). Reich. Ic. Fl. 
Germ. vii. 15 (1845), not L. 
The name compresus, which is used by some authors must be 
discarded, because it is applied by Linnzus himself to several 
species. P. mucronatus, Schrad., is also uncertain, according to 
Mr. Bennett, who has carefully studied the synonymy of this 
species. (See Journ. Bot. May, 1891, p. 150). Fries’ varietal 
name, so far as I can see, is the earliest name applied to it on which 
we can depend. 
Stems compressed, 2-4 feet high, branching, Leaves 116-216 
inches long, about 1 line wide, shortly acute or obtuse and cuspi- 
date, usually 5-nerved, but rarely 7-nerved, biglandular at base, 
the glands small, often dull. Intermediate forms between this and 
P. pusillus often occur in this country in which most of the leaves 
