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 Max., 

 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. BISTOBTA 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. linearifolia. 



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 Cafion; 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- 



