PIPER—FLORA OF THE STATE OF WASHINGTON. 231 
SPECIMENS EXAMINED: Mount Rainier, Flett 305; Piper 2112; Mount Stuart, Elmer 
1232, Brandegee 1066; Goat Mountain, Allen 127; Mount Adams, Henderson, August 9, 
1892; Suksdorf, September, 1877; Plett 1044. 
ZONAL DISTRIBUTION: Arctic. 
This species was formerly confused with the more southern P. davisiae Brewer, and 
appears under that name in Suksdorf’s list. 
22. Polygonum phytolaccaefolium Meisn.; Small, Bull. Torr. Club 19: 360. 1892. 
Type Locauity: California. 
Rance: Washington and Idaho to California. 
SPECIMENS EXAMINED: Mount Adams, Suksdorf 85; 10 miles north of Mount Adams, 
Flett 1053. 
ZONAL pistripuTion: Hudsonian and Arctic. 
23. Polygonum alpinum foliosum (Keller) Small, Bull. Torr. Club 19: 360. 1892. 
Polygonum polymorphum foliosum Keller, Bull. Soc. Bot. Belg. 30: 49. 1891. 
Type Ltocatrry: Mount Adams, Washington. 
Rance: Washington. 
SPECIMENS EXAMINED: Mount Adams, Suksdorf 610 in 1885; Howell d& Henderson in 
1882. . 
24. Polygonum hartwrightii A. Gray, Proc. Am. Acad. 8: 294. 1870. 
Type tocatity: “Sedgy bogs, New York from Herkimer to Yates County, and 
Michigan.” ° 
Rance: British Columbia and Saskatchewan, south to California, Kansas, and Maine. 
SPECIMENS EXAMINED: White Salmon, Suksdorf 482; Coupeville, Gardner 254; Seattle, 
Piper 720; Smith, July 11, 1889; Spokane, Dewart, June 6, 1901; Davis Lake, Kreager 438. 
ZONAL DISTRIBUTION: Transition. 
25. Polygonum amphibium L. Sp. Pl. 1: 361. 1753. 
Type Locauity: Europe. 
Rance: Alaska to Quebec, south to California, Colorado, and Pennsylvania. Europe, 
Asia. 
SPECIMENS EXAMINED: Seattle, Piper, August, 1892; Lake City, lett 170; Lake Wash- 
ington, Piper, August, 1892; Wenache Mountains, Elmer 452; Lake Conconully, Whited 
1316: Pend Oreille River, Lyall in 1861; 6 miles east of Pullman, Piper, July 7, 1899; Lake 
Kalispel, Kreager 338. 
ZONAL DISTRIBUTION: Transition. 
26. Polygonum emersum (Michx.) Britton, Trans. N. Y. Acad. Sci. 8: 73. 1889. 
Polygonum amphibium emersum Michx. FI. 1: 240. 1803. 
Polygonum muhlenbergii Wats. Proc. Am. Acad. 14: 295. 1879. 
Polygonum amphibium terrestre Torr. Fl. U.S. 1: 403. 1824. 
Type tocauiry: ‘Ad ripas fluminis Ohio.” 
Rance: British Columbia to New England, southward to Mexico, Louisiana, and Virginia. 
SPECIMENS EXAMINED: Western Washington, latitude 49°, Lyall in 1858; Coulee City, 
Lake & Hull 645; Rock Lake, Lake, August 3, 1893; Chelan, Elmer 857; junction Crab and 
Wilson creeks, Sandberg & Leiberg 328; Union Flat, Lake & Hull 646; Pullman, Piper 1829; 
Uniontown, Henderson 2699; Prosser, Cotton 812. 
ZONAL pIsTRIBUTION: Arid Transition. 
Prof. E. L. Greene considers the Polygonum emersum as generally understood to be an 
aggregate of many species. Among these Elmer’s 857 is made the type of Persicaria 
chelanica Greene.a Some other segregates of this and related species, namely, Persicaria 
cusickii Greene and Persicaria oregana Greene ¢ occur in Washington and adjoining States. 
This group of species should receive much careful field study. 
a Leaflets 1: 49. 1904. b Op. cit. 42. c Op. cit. 31. 
