96 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Inflorescence simple. 
Stems erect ...........-.---.---------------- +--+ +--+ --- 3. S. simplex. 
Stems floating. 
Nutlets fusiform, dark, 4 mm. lonz .......-2....-.-.----- 4. S. angustifolium. 
Nutlets oblong, obovate, 2 to 3 mm. long -........-...-.. 5. S. minimum. 
1. Sparganium eurycarpum Engelm. in A. Gray, Man. ed. 2. 430. 1856. 
Tyre Locauity: “ Borders of ponds, etc., common northward and especially westward.” 
Ranae: British Columbia to Newfoundland, south to California, Utah, and Virginia. 
SPECIMENS EXAMINED: Kalispel Lake, Kreager 488, a doubtful specimen. 
ZONAL DISTRIBUTION: Transition. 
2. Sparganium androcladum (Engelm.) Morong, Bull. Torr. Club 15: 78. 1888. 
Sparganium simplex androcladum Engelm. in A. Gray, Man. ed. 5, 481. 1867. 
Type Locatity: “From New England southward and especially westward.”’ 
Rance: British Columbia to Nova Scotia, south to Texas and Florida. 
SPECIMENS EXAMINED: Near Montesano, Heller 3865; Seattle, Piper 713;Tacoma, Flett 151; 
Puyallup, Piper, September 2, 1899; Rock Lake, Lake & Hull 630; Touchet River, Horner 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 Loca.ity: “Circa Norwich,’ England. 
Rance: British Columbia to Labrador, south to California and Pennsylvania. 
SPECIMENS EXAMINED: Cascade Mountains, 49°, Lyall in 1859; Seattle, Smith 712; Pe- 
shastin, Sandberg & Leiberg 600; Lake Keechelus, Henderson, July, 1892; without locality, 
Vasey 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. 
Tyre Locauity: “ Hab. in amnibus Canadac.”’ 
Rance: British Columbia to California, east to Ontario and New York. 
SPECIMENS EXAMINED: Without locality, Vasey in 1889. 
ZONAL DISTRIBUTION: Transition. 
5. Sparganium minimum Fries, Sum. Veg. 2: 560. 1846. 
TyPE LOCALITY: Scandinavian. 
Rance: 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 518; Spokane Falls, Watson 399; without locality, Vasey in 
1889. 
ZONAL DISTRIBUTION: Transition to Hudsonian. 
POTAMOGETONACEAE. 
POTAMOGETON. PonpweEEb. 
Floating leaves broad; stipules free. 
Submerged leaves grass-like. 
Stipules long; floating leaves subcordate at base......-.-.- 1. P. natans. 
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. alpinus. 
Petioles of floating leaves long. 
Stipules obtuse.......-.-.-.------------------- 5. P. heterophyllus. 
Stipules acuminate............-.--------------- 6. P. lonchites. 
