EUPHORBIACEAE. 
223 
Leaves toothed, but sometimes only at the apex. 
Capsule, stem and leaves glabrous. 
Seeds strongly transversely wrinkled. 8. C. glyptosperma. 
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. (E . revoluta Engelm.) On hill¬ 
sides from Tex. and Colo, to N. M.; also northern Mex.—Canon 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 Canon. 
4. Chamaesyce flagelliformis (Engelm.) Rydb. (E . petaloidea dagelliformis 
Engelm.; E. dagelliformis 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. (E. 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; Canon City; Black’s Lake; Cedar 
Hills. 
7. Chamaesyce lata (Engelm.) Small. (E . 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; New 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 Canon; between Porter and 
Durango. 
10. Chamaesyce serpyllifolia (Pers.) Small. ( E . serpyllifolia Pers.) 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 Canon 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. 
