546 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



39. Euphorbia abramsiana L. C. Wheeler, South. Calif. Acad. Sci. 



Bui. 33: 109. 1934. 

 Yavapai, Maricopa, Pinal, Pima, and Yuma Counties, 140 to 3,000 

 feet. Arizona, southeastern California, and northwestern Mexico. 



40. Euphorbia micromera Boiss. ex Engelm., Amer. Acad. Arts and 



Sci. Proc. 5: 171. 1861. 



Euphorbia pseudoserpyllifolia Millsp., Pittonia 2: 87. 1890. 

 Chamaesyce micromera Woot. and Standi., Contrib. U. S. 



Natl. Herbarium 16: 144. 1913. 

 Chamaesyce pseudoserpyllifolia Millsp., Field Museum Nat. 



Hist. Bot. Ser. 2: 411. 1916. 



Navajo County to Cochise and Pima Counties, 500 to 5,000 feet, 

 type from near the San Pedro River, Cochise County (Wright in 1851). 

 Western Texas to Utah, southeastern California, and northern 

 Mexico. 



41. Euphorbia indivisa (Engelm.) Tidestrom, Biol. Soc. Wash. Proc. 



48: 41. 1935. 



Euphorbia dioeca H. B. K. var.? indivisa Engelm. in Torr., 



U. S. and Mex. Bound. Bot. 187. 1859. 

 Chamaesyce indivisa Millsp., Field Museum Nat. Hist. Bot. 



Ser. 2: 387. 1914. 



Near Prescott (Yavapai County), to Cochise, Santa Cruz, and 

 Pima Counties, 2,600 to 5,000 feet. Western Texas to Arizona and 

 northern Mexico. 



42. Euphorbia stictospora Engelm. in Torr., U. S. and Mex. Bound. 



Bot. 187. 1859. 



Chamaesyce stictospora Small, Fl. Southeast. U. S. 714, 1334. 

 1903. 



Mountains of Cochise, Santa Cruz, and Pima Counties, 3,600 to 

 5,500 feet. South Dakota and Wyoming to Arizona, Durango, and 

 Zacatecas. 



43. Euphorbia supina Raf., Amer. Month. Mag. 2: 119. 1817. 



Euphorbia maculata of authors. Not of L. 



Near Metcalf (Greenlee County), Devil's Canyon (Gila County), 

 Tucson (Pima County). Eastern United States to North Dakota 

 and Texas, introduced here and there farther west. 



44. Euphorbia chamaesyce L., Sp. PL 455. 1753. 



Euphorbia prostrata Ait., Hort. Kew 2: 139. 1789. 

 Chamaesyce prostrata Small, Fl. Southeast. U. S. 713, 1333. 

 1903. 



Eight miles west of Florence (Pinal County), Santa Cruz River 

 at La Noria (Santa Cruz County), Tucson (Pima County), 1,500 to 

 4,500 feet. South Carolina and Florida to southern Arizona, south- 

 ward into tropical America. 



