400 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



10. Chamaesyce chaetocalyx (Boiss.) Woot. & Standi. Contr. U. S. Nat. Herb. 

 16: 144. 1913. 



Euphorbia fendleri chaetocalyx Boiss. in DC. Prodr. 15 2 : 39. 1862. 



Type locality: "In Novo-Mexico." Type collected by Wright (no. 1847). 



Range: Western Texas to Arizona. 



New Mexico: Canyoncito; Los Lunas; Albuquerque; San Augustine Plains; 

 Kingston; Organ Mountains; Tortugas Mountain; White Mountains; Queen. Dry 

 mesas and hills, in the Lower Sonoran Zone. 



11. Chamaesyce serpens (H. B. K.) Small, Fl. Southeast. U. S. 709. 1903. 

 Euphorbia serpens H. B. K. Nov. Gen. & Sp. 2: 52. 1817. 



Type locality: "Crescit in umbrosis Cumanae prope Borcones et Punta Araya," 

 Yenzuela. 



Range: Iowa to New Mexico, western Texas, and Mexico. 



New Mexico: South of Roswell; Carlsbad; mesa west of Organ Mountains. Plains 

 and mesas, in the Lower Sonoran Zone. 



12. Chamaesyce geyeri (Engelm.) Small, Fl. Southeast. U. S. 709. 1903. 

 Euphorbia geyeri Engelm. Bost. Journ. Nat. Hist. 5: 260. 1845. 



Type locality: "Beardstown, Illinois, and Upper Missouri." 

 Range: Minnesota and Illinois to Oklahoma and New Mexico. 

 New Mexico: Zuni; Estancia; Pecos. Dry plains and hills, in the Upper Sonoran 

 Zone. 



13. Chamaesyce micromera (Boiss.) Woot. & Standi. Contr. U. S. Nat. Herb. 16: 

 144. 1913. 



Euphorbia micromera Boiss. in DC. Prodr. 15 2 : 44. 1862. 



Type locality: Sonora. 



Range: New Mexico and Arizona and adjacent Mexico. 



New Mexico: Mesa west of Organ Mountains. Mesas, in the Lower Sonoran Zone. 



14. Chamaesyce revoluta (Engelm.) Small, Fl. Southeast. U. S. 711. 1903. 

 Euphorbia revoluta Engelm. in Torr. U. S. & Mex. Bound. Bot. 186. 1859. 

 Type locality: Gravelly hills near Rock Creek, western Texas. 



Range: Western Texas to Arizona, south into Mexico. 



New Mexico: Mesa west of Organ Mountains; Gray; Hillsboro; Mangas Springs. 

 Mesas and dry hills, in the Lower Sonoran Zone. 



15. Chamaesyce petaloidea (Engelm.) Small, Fl. Southeast. U. S. 711. 1903. 

 Euphorbia petaloidea Engelm. in Torr. U. S. & Mex. Bound. Bot. 185. 1859. 

 Type locality: Not stated. 



Range: Wyoming and Idaho to New Mexico and Texas. 



New Mexico: San Juan Valley; lower Pecos Valley. Dry hills, in the Upper and 

 Lower Sonoran zones. 



16. Chamaesyce flagelliformis (Engelm.) Rydb. Colo. Agr. Exp. Sta. Bull. 100: 

 223. 1906. 



Euphorbia petaloidea flagelliformis Engelm. in Torr. U. S. & Mex. Bound. Bot. 185. 



1859. 

 Euphorbia flagelliformis Engelm. ; T. S. Brandeg. Bull. U. S. Geol. Geogr. Surv. 



Terr. 2: 243. 1876. 

 Type locality: New Mexico. 

 Range: Colorado to Texas and New Mexico. 



New Mexico: Sabinal; Lava; Mesilla Valley; south of Melrose; Farmington. Dry 

 hills and plains, in the Lower and Upper Sonoran zones. 



17. Chamaesyce glyptosperma (Engelm.) Small, Fl. Southeast. U. S. 712. 1903. 

 Euphorbia glyptosperma Engelm. in Torr. U. S. & Mex. Bound. Bot. 187. 1859. 

 Type locality: On the Rio Grande, Texas. 



