260 MISC. PUBLICATION 4 2 3, U. S. DEPT. OF AGRICULTURE 



7. Polygonum ramosissimum Michx., Fl. Bor. Amer. 1: 237. 1803. 

 Flagstaff, Coconino County {Jones 3991), White Mountains, Apache 



County {Griffiths 5378), August. Widely distributed in North 

 America. 



8. Polygonum viviparum L., Sp. PL 360. 1753. 



Bistorta vivipara S. F. Gray, Nat. Arrang. Brit. PI. 2: 268. 1821. 



Inclusion of this species in the Arizona flora rests only upon the 

 doubtful basis of a collection by E. Palmer in 1869, without locality 

 except "Arizona." Greenland to Alaska, south to New Mexico (and 

 Arizona?) ; Eurasia. 



9. Polygonum bistortoides Pursh, Fl. Amer. Sept. 271. 1814. 



Bistorta bistortoides Small, Torrey Bot, Club Bui. 33: 57. 1906. 



Apache, Coconino, and Graham Counties, 8,500 to 9,500 feet, June 

 to August. Montana to British Columbia, New Mexico, Arizona, 

 and California. 



A conspicuous plant in wet mountain meadows, with rather tall 

 erect stems and dense spikes of white flowers. Most of the Arizona 

 specimens belong to the glabrous-leaved var. oblongifolium (Meisn.) 

 St. John. 



10. Polygonum amphibium L., Sp. PL 361. 1753. 



Persicaria amphibia S. F. Gray, Nat. Arrang. Brit. Plants 2: 

 268. 1821. 



Lakeside, Navajo County {Harrison 5504), Tuba, Coconino County 

 {Purchase 5086), 5,000 to 6,000^ feet, in ponds. Quebec to Alaska, 

 south to New Jersey, New Mexico, eastern Arizona, and California; 

 Europe. 



Some authorities regard the American plant as specifically distinct 

 from P. amphibium of the Old World. 



11. Polygonum coccineum Muhl. ex Willd., Enum. PL 428. 1809. 



Polygonum muhlenbergii (Meisn.) S. Wats., Amer. Acad. Arts 



and Sci. Proc. 14: 245. 1879. 

 Persicaria muhlenbergii Small in Rydb., Colo. Agr. Expt. Sta. 



Bui. 100: 111. 1906. 



Apache, Navajo, and Coconino Counties, south to Santa Cruz and 

 Pima Counties, 2,300 to 7,200 feet, in ponds, ditches, and marshes, 

 July to September. Maine to Alaska, south to Virginia, Mexico, 

 Arizona, and California. 



Persicaria fistulosa, P. ophiophila, and P. rothrockii of Greene, all 

 based upon Arizona types, seem to be merely forms of P. coccineum. 



12. Polygonum lapathifolium L., Sp. PL 360. 1753. 



Persicaria lapathijolia S. F. Gray, Nat. Arrang. Brit. PL 2: 

 270. 1821. 



Navajo and Coconino Counties to Cochise and Pima Counties, 1,000 

 to 6,000 feet, along streams, April to October. Throughout most of 

 North America; probably introduced from Europe. 



Persicaria granulata Greene is probably a synonym. It was based 

 upon a collection on the Verde River {Smart in 1867). 



