POLYGONACEAE. 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 Canon, 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. Canon 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. ftexum, Jones.) Arid places of Colo. 

 Alt. about 6000 ft. McElmo Canon; Grand Junction. 



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

 San Juan and Mancos Valleys {Brandegee}. 



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. 



2. R. pauciflorus. 



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

 Inner perianth-lobes entire, undulate or denticulate. 

 Inner perianth-lobes without tubercles. 



