96 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Inflorescence simple. 



Stems erect . . .* 3. ^S:. simplex. 



Stems floating. 



Nutlets fusiform, dark, 4 mm. lonjj 4. ,S. anguatifclxum. 



Nutlets oblong, obovate, 2 to 3 mm. long 5. -S. minimum. 



1. Sparganium eurycarpum. Engelm. in A. Gray, Man. eil. 2. 430. 1856. 



Type locality: "Borders of ponds, etc., common northward and esptn-iall}- westward." 

 Range: British Columbia to Newfoundland, south to California, Utah, and Virginia. 

 Specimens e.\.\mined: Kalispel Lake, Krear/er 488, a doubtful spwimen. 

 Zonal distribution: Transition. 



2. Sparganium androcladum (Engelm.) Morong, Bull. Torr. Club 16: 78. 1888. 

 Sparganium simpler androcladum Engelm. in A. Gray, Man. ed. 5. 481. 1867. 

 Type locality: "From New England southward and especially westward." 

 Range: British Columbia to Nova Scotia, south to Te.xas and Florida. 



Specimens exa.mined: NearMontesano, Fleller '^SG.'i-.Sc&tilc, Piper7l'S:T&comfi, Fleff 151 ; 

 Puyallup, Piper, September 2, 1899 ; Rock Lake, iMke cfc Hull 630 : Touchet River, Iloriwr 20. 

 Zonal distribution: Transition. 

 This species was referred to in Cooper's Report as S. ramosum Smith. 



3. Sparganium simplex Huds. Fl. Angl. ed. 2. 401. 1778. 

 Type locality: "Circa Norwich," England. 



Range: British Columbia to Labrador, south to California and Pennsylvania. 



Specimens ex.\mined: Cascade Mountains, 49°, Lyall in 1859; St^attle, Smith 712; Pe- 

 shastin, Sandberg cfc Leiberg 600; Lake Keechelus, Henderson, July, 1892; without locality, 

 Vaseg in 1889. 



Zonal distribution: Transition. 



4. Sparganium angustifolium Michx. Fl. 2: 189. 1803. 



Sparganium simplex angustifolium Engelm. in A. Gray, Man. ed. 5. 481. 1867. 



Type locality: "Hab. in amnibus Canadae." 



Range: British Columbia to California, east to Ontario and New York. 



Specimens examined: Without locality, Vasey in 1889. 



Zonal distribution: Transition. 

 6. Sparganium minimum Fries, Sum. Veg. 2: 560. 1846. 



Type locality: Scandinavian. 



Range: British Columbia to New Brunswick, south to Oregon, Utah, and Pennsylvania. 

 Europe. 



Specimens examined: Mount Rainier, Smith in 1889; Mount Adams, Henderson, August, 

 1882; Falcon Valley, Suksdorf 51H; Spokane Fails, Watson 399; without locality, Vasey in 

 1889. 



Zonal distribution: Transition to Iludsonian. 



POTAMOGETONACEAE. 



POTAMOGETON. Pondweed. 



Floating leaves broad; stipules free. 

 Submerged leaves grass-like. 



Stipules long; floating leaves subcordate at base 1. P. nutans. 



Stipules short; floating leaves attenuate at base '. 2. P. nuttaUii. 



Submerged leaves lanceolate. 



Floating leaves 30 to .50-nerved 3. P. amplifolius. 



Floating leaves 10 to 20-nerved. 



Petioles of floating leaves short 4. P. alpinus. 



Petioles of floating leaves long. 



Stipules obtuse 5. P. heterophyllus. 



Stipules acuminate 6. P. lonchites. 



