EUPHORBIACEAE. 



oo^ 



Leaves toothed, but sometimes only at the apex. 

 Capsule, stem and leaves glabrous. 



Seeds strongly transversely wrinkled. 8. C. glyptosperina. 



Seeds pitted or irregularly and faintly wrinkled. 



Seeds deeply and irregularly pitted. 9. C. rugulosa. 



Seeds faintly pitted or wrinkled. 



Leaves oblong ; seeds usually with a white bloom. 



10. C. serpyllifolia. 

 Leaves linear ; seeds brownish, usually without bloom. 



11. C. albicaulis. 

 Capsule, stem and leaves pubescent. 12. C. stictospora. 



1. Chamaesyce serpens (H. B. K.) Small. {Euphorbia serpens H. B. K.) 

 On prairies from Ont. and S. D. to Fla. and Ariz. ; also Mex. — New Windsor, 

 Weld Co. 



2. Chamaesyce revoluta (Engelm.) Small. (£. revoluta Engelm.) On hill- 

 sides from Tex. and Colo, to N. M. ; also northern Mex. — Cafion City. 



3. Chamaesyce petaloidea (Engelm.) Small. (E. petaloidea Engelm.) On 

 prairies and hillsides, especially in sandy soils, from Iowa and Wyo. to Tex. 

 and Colo. — Alt. 4000-7000 ft. — Boulder; La Veta; Crow Creek; Longmont; 

 Boulder Caiion. 



4. Chamaesyce flagelliformis (Engelm.) Rydb. {E. petaloidea Aagelliformis 

 Engelm.; E. flagelliformis Engelm.) In dry soil from Colo, to Tex. and N. 

 M. — " Southwestern Colorado." 



5. Chamaesyce albomarginata (T. & G.) Small. (E. albomarginata T. & 

 G.) In dry soil from Colo, and Utah to Tex. and Calif.; also Mex. — Upper 

 Platte. 



6. Chamaesyce Fendleri (T. & G.) Small. (£. Fendleri T. & G.) On 

 dry hills, in sandy soil, from Neb. and Wyo. to Tex. and Ariz. — Alt. 4000-6000 

 ft. — Foot-hills near Boulder; Trinidad; Caiion City; Black's Lake; Cedar 

 Hills. 



7. Chamaesyce lata (Engelm.) Small. (£. lata Engelm.) On plains and 

 prairies from Kans. and Colo, to Tex. and N. M. — " Southwestern Colorado." 



8. Chamaesyce glyptosperma (Engelm.) Small. (£. glyptosperma Engelm.) 

 In sandy soil from Ont. and B. C. to Tex. and Mex.— Alt. 4000-7000 ft. — 

 Colorado Springs; Denver; Deer Run; Canon City; Pueblo; Boulder; Fort 

 Collins; Manitou; Newr Windsor; gulch west of Soldier Canon; Miller's 

 ranch, between Fort Collins and La Porte; Horsetooth Gulch. 



9. Chamaesyce rugulosa (Engelm.) Rydb. {E. serpyllifolia rugulosa 

 Engelm.) In sandy soil from Wyo. to N. M. and Calif.— Mountains between 

 Sunshine and Ward ; gulch west of Soldier Caiion ; between Porter and 

 Durango. 



10. Chamaesyce serpyllifolia (Pars.) Small. (£. serpyllifolia Pars.) In 

 dry soil from Mich, and Wash, to Tex. and Calif. ; also Mex. — Alt. 4000-8000 

 ft. — Antonito ; Lyons ; Arboles ; Gunnison ; Durango ; Manitou ; Parlin ; 

 Boulder Co.; Box Caiion west of Ouray; between Fort Collins and La Porte; 

 Rocky Ford. 



11. Chamaesyce albicaulis Rydb. {E. albicaulis Rydb.) In old fields and 

 sandy soil from Neb. and Mont, to N. Mex. — Alt. 4000-5500 ft. — Foot-hills 

 west of Fort Collins. 



