130 Rhodora [June 



61,283). ALBERTA: west of Banff, July 6, 1891, ./. Macoun (C no. 

 4,384); near Banff, July 15, 1891, ./. Macoun (C no. 4,376); Bow 

 River Valley, 4,500 feet altitude, July 28, 1906, Stewardaon Brown, 

 no. 680 (A). Montana: Corvallis, Bitterroot Valley, July 29, 1880 

 S. Watson, no. 393 (H); near Frenchtown, Bitterroot Valley, Aug. 4, 

 1880, (8. Watson (H). WTOMING: Lower Basin, Yellowstone Park, 

 7,300 feet altitude, July 15, 1906, W. S. Cooper, no. 74y (R); brackish 

 ponds, Yellowstone Park, Aug. 1884, Frank Tweedy (Y); Upper 

 Geyser Basin, Sept. 1, 1S7S, (\ Richardson (H); Big Horn Mountains, 

 July-Aug., 1897, T. A. Williams (R), Colorado: Twin Lakes, 

 Sept., Wolf <t- Roikrock (H); Gunnison, 7,680 feet altitude, Aug. 16, 

 1901, C. F. Baker, no. 82S (H & R); Buena Vista, ./. //. Ferries (II). 

 Utah: Bear River, 8,000 feet altitude, Aug., 1S69, S. Watson, no. 

 1,144 (II & Y). Rocky Mountains: Drummond, no. 134 (H). 

 British COLUMBIA: fresh water lakes, near Kicking Horse Lake, 

 5,500 feet altitude, Aug. 15, 1890, ./. Macoun (C no. 3,010). Yukon: 

 mud in Klondike River, near Dawson, July 15, 1902, ./. Macoun (C no. 

 79,02!)); in water, Lewis River, Dawson,' latitude 62°, Sept. 6, L887 

 (C no. 4,146). Alaska: water, Atkali Island, Aleutian Islands, Aug. 

 26, 1S9I, ,/. M. Macoun (C no. 28,159). India: (larhwal, elevation 

 15,000 feet, R. Strachey & ./. K. Wintcrbotiom (H). Tibet: left shore 

 of the Indus near Leh. Province of Ladak, July 5 10, 1856, Schlagini- 

 weit, no. 923 (II). China: 1873, KoroUcoff & Krause (H). 



Rafinesqne's name P. boreal is is based on the description in 

 Miehaux's Flora Boreali- Americana, i. 102 (1803) of P. marinumf L., 

 for plants found in suhsaline rivers flowing into the St. Lawrence. 

 Miehaux's use of the phrase "spica — , quasi verticillatim Interrupta" 

 indicates that be was describing the plant with a short spike of nearly 

 approximate whorls. Tims we can use Rafinesque's name to desig- 

 nate this commonest American variety of P. fiiiformis. It is worthy 

 of note that in the paper referred to, Rafinesque indicates as new 

 species, four Pot amogetons "that have been considered congenial to 

 some European species; but which upon investigation, have appeared 

 to me different." Three of these, P. epihydrus, diversifolius, and 

 foltOStU have already been taken up and now we can recognize as of 

 varietal rank the fourth, his P. borealis. 



The var. borealis, like typical /\ filifonuis, is found with the spike 

 exceeding or exceeded by the leaves and the Stem short, busbily 

 branched, or in deep water less branched and the stem elongate. 



P. FILIFORMI8 IVrs., var. Macqunii Morong. Mem. Torr. Hot. Club, 

 iii. no. 2, 50 (1893). /'. marinns L.,var. Macounii Morong in Macoun, 

 Cat. Can. PI. iv. SS (1888).— Resembling var. borealis in its short 

 spike of mostly approximate whorls, but differing in having broad 



