96 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Inflorescence simple. 



Stems erect 3. .S'. simplex. 



Stems floating. 



Nutlets fusiform, dariv, 4 mm. Ion"; 4. iS'. a nyusti folium. 



Nutlets oblong, obovate, 2 to 3 mm. long 5. <9. minimum. 



1. Sparganium eurycarpum Engelm. in A. Gray, Man. ed. 2. 4.30. 1856. 



Type locality: "Borders of ponds, etc., common northward and especially westward." 

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

 Specimens examined: Kalispel Lake, Kreager 488, a doubtful .specimeiL 

 Zonal distribution: Transition. 



2. Sparganium androcladum (Engelm.) Morong, Bull. Torr. C]ul> 15: 78. 1888. 

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

 Type locality' "From New England southward and e.specially westward." 

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



Specimens examined: NearMontesano, Heller 3865; Seattle, Piper 713; Tacoma, Fhif 151 : 

 Puyallup, Piper, September 2, 1899; Rock Lake, Lai- e <& Hull GSO; Touchet RWer, Horner 20. 

 Zonal distribution: Transition. 

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



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

 Type lo('ality: "Circa Norwich," England. 



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



Specimens examined: Cascade Mountains, 49°, Lyall in 1859; Seattle, Smith 712; Pe- 

 shastin, Sandberg dfc Leiherg 600; Lake Keechelus, /7e7i(/er,'.'0?i, July, 1892; without locality, 

 Vasey in 1889. 



Zonal distribution: Transition. 



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



Sparganium simple.r arigii.stifoHum Engelm. in A. Gray, Man. ed. 5. 481. 1867. 



Type locality: "Hab. in amnibus Canadao." 



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



Specimens examined: Without locality, Va.sey iu 1889. 



Zonal distribution: Transition. 



5. Sparganium mininium Fries, Sum. Veg. 2: 560. 1846. 

 Type locality: Scandinavian. 



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

 Europe. 



Specimens ex.\mined: Mount Rainier, Smith in 1889; Mount Adams, Henderson, August, 

 1882; Falcon Valley, Suksdorf .'ylS; Spokane Falls, Watson 399; without locality, Va.sey in 

 1889. 



Zonal distribution: Transition to Hudsonian. 



POTAMOGETONACEAE. 

 POTAMOGETON. Pondweed. 



Floating leaves broad; stipules free. 

 Submerged leaves grass-like. 



Stipides long; floating leaves subcordate at base \. P. nutans. 



Stipules short ; floating leaves attenuate at base 2. P. nuttallii. 



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. alptnus. 



Petioles of floating leaves long. 



Stipules obtuse 5. P. heterophyllus. 



Stipules acuminate 6. P. lonchites. 



