POLYGONACEAE. 
109 
7. Rumex occidentals 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. ( R . maritimus L.) In or near water from 
Que. and B. C. to N. C. and Calif.—Parlin; Gunnison; Canon City; Higho; 
New Windsor; Steamboat Springs; above Bents’ Fort. 
3. OXYRIA Hill. Mountain Sorrel. 
1. 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. erectum. 
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. 
