112 POLYGONACEAE. 



and Calif. ; also in Mex. Alt. up to 6000 ft. Uncompahgre Mountains, near 

 Los Pinos ; Fort Collins ; Alamosa. 



3. Persicaria Hartwrightii (A. Gray) Small. (Polygonum Hartwrightii 

 A. Gray.) In wet places and shallow water from Me. and Wash, to Pa. 

 and Calif. Alt. 4000-6000 ft. Canon City; Denver. 



4. Persicaria omissa (Greene) Small. (Polygonum Pennsylvanicum Coult. ; 

 not L. ; P. omissum Greene.) In wet ground and dried up ponds in Kans. 

 and Colo. Alt. up to 5000 ft. Loveland, Larimer Co. 



5. Persicaria incarnata (Ell.) Small. {Polygonum incarnatum Ell.) In 

 wet soil from Vt. and Ida. to Fla. and Calif. Alt. up to 5000 ft. Fort Col- 

 lins ; New Windsor. 



6. Persicaria lapathifolia (L.) S. F. Gray. (Polygonum lapathifolium L.) 

 In wet soil from Que. and B. C. to Fla. and Calif; also in Mex., W. Ind., 

 Europe and Asia. Alt. up to 5000 ft. Fort Collins. 



7. Persicaria incana (Koch) S. F. Gray. (Polygonum lapathifolium in- 

 canum Koch.) In swamps from Newf. and B. C. to N. Y. and Colo. Alt. 

 up to 6000 ft. Alamosa. 



8. Persicaria Persicaria (L.) Small. (Polygonum Persicaria L.) In waste 

 places and rich ground from Newf. and B. C. to Fla. and Calif. ; also in 

 Mex. and Europe. Alt. 4000-6000 ft. Boulder; Livermore; Fort Collins. 



9. Persicaria punctata (Ell.) Small. (Polygonum punctatum Ell.) In 

 swamps and wet places from Me. and Wash, to Fla. and Calif. ; also in Mex., 

 Cent. Am., W. Ind. and S. Am. Alt. up to 5000 ft. Fort Collins; plains 

 near Boulder. 



10. Persicaria Hydropiper (L.) Opiz. (Polygonum Hydropiper L.) In wet 

 places from Newf. and B. C. to Ga. and Calif. ; also in Mex., Cent. Am. and 

 Europe. Alt. 4000-5000 ft. Fort Collins; Denver. 



6. BISTORTA Tourn. BISTORT. 



Racemes not viviparous (not bulblet bearing), oblong, 1-2 cm. thick. 



Perianth 5-6 mm. long ; leaf-blades lanceolate, oblong or oblanceolate. 



i. B. bistortoides. 



Perianth 3-4 mm. long ; basal leaf-blades linear. 2. B. Imearifolia. 



Racemes viviparous (bulblet bearing below), linear, 5-8 mm. thick. 



3. B. vivipara. 



1. Bistorta bistortoides (Pursh) Small. (Polygonum Bistorta oblongi- 

 folium Meisn.) In wet meadows and swamps in the mountains from Mont, 

 and Wash, to N. M. and Calif. Alt. 7000-13,000 ft. " Rocky Mountains " ; 

 Lake City; Halfway House, Pike's Peak; Cabin Canon; Mt. Harvard; Colum- 

 bine ; South Park ; Mt. Garfield ; Pagosa Peak ; Grayback mining camps and 

 Placer Gulch ; Garden of the Gods ; Ruxton ; Cameron Pass ; Graymont ; 

 Chicken Creek, West La Plata Mountains; Marshall Pass; Oak Mesa; 

 Beaver Creek, Larimer Co. ; Boreas ; Gore Pass. 



2. Bistorta linearifolia (S. Wats.) Greene. (Polygonum Bistorta lineari- 

 folium S. Wats.) In alpine swamps and along streams from Mont, to Colo, 

 and Nev. Alt. 7000-10,000 ft. Alpine ridges east of Middle Park; "Rocky 

 Mountains"; Pike's Peak. 



3. Bistorta vivipara (L.) S. F. Gray. (P. viviparum L.) In alpine or sub- 



