POLYGONACEAE. 109 



7. Rumex occidentalis S. Wats. In wet ground from Alb. and B. C. to 

 N. M. and Calif.— Alt. 5000-8000 ft,— West Cliff; Hot Sulphur Springs; 

 Steamboat Springs; Veta Pass; Mountain View, Pike's Peak; Gunnison; 

 Idaho Springs; Pine Creek; Twin Lakes; Parlin, Gunnison Co.; forks of 

 White River. 



8. Rumex densiflorus Osterh. (R. Bakeri Greene.) In wet ground in 

 Wyo. and Colo.— Alt. up to 10,000 ft— Idaho Springs; North Park; Gunni- 

 son; Fort Collins; summit of North Park Range, Routt Co. 



9. Rumex subalpinus M. E. Jones. In swampy ground in the mountains 

 of Colo, and Utah.— Alt. about 10,000 ft— Keblar Pass; Pagosa Peak; Cam- 

 eron Pass; North Park; Deadman Canon. 



10. Rumex Patientia L. Cultivated and occasionally escaped from Mass. 

 and N. J. to Utah; native of Europe.— Pass Creek; Little Kate Basin (?). 



11. Rumex altissimus Wood. In valleys and wet places from Mass. and 

 Wash, to Va. and Colo.— Mouth of Deer Creek. 



. 12. Rumex crispus L. In waste places from Newf. and Mont, to Fla. and 

 Calif.; introduced from Europe. — Alt. about 5000 ft. — Fort Collins. 



13. Rumex salicifolius Weim. Along rivers and lakes from Ont. and Alaska 

 to Tex. and Calif. ; also in Mex. — Alt. 4000-10,000 ft. — Zola ; Sangre de Cristo 

 Creek; Calhan; Fort Collins; Cucharas Valley, near La Veta; La Plata; 

 Boulder; New Windsor; Robinson; Alamosa; Pitkin; Empire; Pueblo; 

 Steamboat Springs. 



14. Rumex obtusifolius L. In waste places from Vt. and Neb. to Ga. and 

 Colo. ; introduced from Europe. — Alt. about 5000 ft. — Fort Collins. 



15. Rumex persicarioides L. (i?. maritimus L.) In or near water from 

 Que. and B. C. to N. C. and CaHf— Parlin ; Gunnison; Canon City; Higho; 

 New Windsor; Steamboat Springs; above Bents' Fort. 



3. OXYRIA Hill. Mountain Sorrel. 



I. Oxyria digyna (L.) Compt. In the mountains among rocks from Greenl. 

 and Alaska to N. H., Colo., Ariz, and Calif. ; also in Europe and Asia. — Alt. 

 9000-14,000 ft. — Cameron Pass; headwaters of Clear Creek; Ouray; Bottom- 

 less Pit, Pike's Peak; Mt. Harvard; Red Mountain, south of Ouray; Red- 

 cliffe; Ironton; Clear Lake; Pagosa Peak; Mt. Hesperus; Chambers' Lake; 

 Berthoud Pass ; Beaver Creek ; Graymont ; Hahn's Peak. 



4. POLYGONUM L. Knot-weed. 

 Fruit erect. 



Inflorescence, of small axillary clusters, scattered more or less throughout the 



plant ; all with elongated stems or branches ; perianth-lobes never keeled 



near the apex. 



Plants copiously leafy throughout ; upper leaves scarcely reduced, more 



crowded. 



Perianth-lobes with yellowish green margins ; plant erect with spreading 



branches in age, leaves broad, yellowish green. 1. P. erechtm. 



Perianth-lobes with white, pink or purplish margins ; plants prostrate or 

 diffusely spreading ; leaves from bright to pale bluish green. 

 Leaves thick, prominently veined, usually pale ; ocrea very conspicuous ; 



faces of the achenes granular. 2. P. buxiforme. 



Leaves thin, not prominently veined, bright green ; ocrea not conspicuous ; 

 faces of the achenes finely striate. 3. P. aviculare. 



