The Naiadaceae of North America

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(Porter); Lake Superior (Robbins); Vermilion Lake, Minn. (L. H. Bailey); Sherburne Geyer Basin, Wyoming (Clifford Richardson). July-August (Plate XLVIII. ) 25. POTAMOGETON MAJOR (Fries) Morong.
P. Pusilllns L. Var. Major > Fries, Nov. 48 (1828). ' P. Friesii, Ruprecht in Beit. Pf. De Russ. R. Iv. 43 (1845).
P. Compresses, 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 Lin
...naeus himself to several species. P, mncronatus, 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 I ^-2 */ inches long, about I line wide, shortly acute or obtuse and cuspi- date, usually 5 -nerved, but rarely 7-nerved, biglandular at base, the glands small, often dull.


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