POLYGON ACEAE. 107 



35. Eriogonum microthecum Nutt. Dry plains from Mont, and Wash, to 

 Colo, and Calif. — Colorado City; Beaver Creek. 



36. Eriogonum Simpsonii Benth. Dry plains from Colo, to Tex. and Ariz. 

 — San Luis Valley; Rio Florido. 



37. Eriogonum contortum Small. Arid plains of western Colo. — Grand 

 Junction. 



38. Eriogonum annuum Nutt. In sandy soil from S. D. and Mont, to Tex. 

 and Mex. — Alt. 4000-7500 ft. — Piney Creek of Grand River; Denver; Mani- 

 tou; Ute Pass; Colorado Springs; Golden; Table Rock. 



39. Eriogonum racemosum Nutt. Dry plains and hills from Colo, and 

 Utah to Tex. and Ariz. — Alt. 6000-8000 ft. — Between Parrott and Hesperus; 

 Jack's Cabin; Gunnison; hills about Box Caiion, west of Ouray; Dolores; 

 Piedra; between Porter and Durango; Mancos; Durango. 



40. Eriogonum Wrightii Torr. Dry plains from Colo, and Utah to Tex. 

 and Calif.; also northern Mex. — "Colorado" (Thurber). 



41. Eriogonum Gordonii Benth. Dry plains and " bad-lands " of Wyo. and 

 Colo. — Canon City; Gunnison Valley; mesa, Montrose; Grand Junction. 



42. Eriogonum rotundifolium Benth. Dry plains from Colo, to Tex. and 

 N. M. ; also in northern Mex. — " Near the Rocky Mountains." 



43. Eriogonum tenellum Torr. In arid places from Colo, to Tex. and Mex. 

 — " Southwest Colorado." 



44. Eriogonum cernuum Nutt. " Bad-lands," hills and in canons from Mont, 

 and Ida. to Colo, and Ariz. — Alt. 4000-10,000 ft. — Caiion City; South Park; 

 along the McElmo River ; Grand Junction ; along Platte River, near Denver ; 

 Parlin, Gunnison Co.; Valley Spur; Granite; Buena Vista; Gunnison; Min- 

 nehaha; Black Canon of the Gunnison; Troublesome; Upper Arkansas River; 

 Bahia Salada, South Park; Sierra Blanca; Sargent's. 



45. Eriogonum trinervatum Small. Arid places of Colo, and Utah. — Alt. 

 4000-7000 ft. — Cimarron ; Grand Junction. 



46. Eriogonum fusiforme Small. In sandy places and dry hills from Colo, 

 to Utah and Ariz. — Alt. 4000-5000 ft. — Grand Junction ; Palisade, Mesa Co. ; 

 dry adobe hills, between Delta and Hotchkiss. 



47. Eriogonum inflatum Torr. In arid places from Colo, to Ariz, and Cal. 

 — Alt. 4000-5000 ft. — On the Upper Colorado; Grand Junction. 



48. Eriogonum glandulosum Nutt. (E. iiexiim Jones.) Arid places of Colo. 

 — Alt. about 6000 ft. — McElmo Caiion; Grand Junction. 



49. Eriogonum divaricatum Hook. Dry hills from Wyo. to Colo, and Ariz. 

 — San Juan and Mancos Valleys (Brandegec). 



50. Eriogonum salsuginosus Hook. In dry alkaline soil from Wyo. to Utah 

 and N. M. — Alt. 4000-6000 ft. — Near the Mancos River; Grand Junction; 

 McElmo Canon ; San Juan Valley. 



2. RUMEX L. Sorrel, Dock. 



Flowers dioecious ; foliage acid. 



Leaves with auricled or hastate bases. i. R. Acetosella. 



Leaves narrowed at the base, neither auricled nor hastate. 



Flowers perfect, or andro-polygamous ; foliage not acid. 

 Inner perianth-lobes entire, undulate or denticulate. 

 Inner perianth-lobes without tubercles. 



2. R. pauciflorus. 



