EUPHORBIACEAE. 



VOL. II. 



9. Chamaesyce albicaulis Rydb. "White- 

 stemmed Spurge. Fig. 2740. 



Euphorbia albicaulis Rydb. Mem. N. Y. Bot. Card. I : 

 266. 1900. 



Chamaesyce albicaulis Rydb. Fl. Colo. 223. 1906. 



Annual, pale green or yellowish. Branches pro- 

 cumbent, 4'-i2 f long, glabrous, shining; leaves 

 linear or slightly broadened upward, 5"-7$" long, 

 toothed at the apex ; involucres turbinate, about 

 i" high; appendages minute, rather broad, white, 

 truncate or crenulate; capsule about i" long, 

 smooth, acute-angled ; seeds light gray, oblong, 

 I" long or less, acutely 4-angled, shallowly trans- 

 versely wrinkled. 



In sandy soil, Nebraska to Montana and New Mex- 

 ico. June-Sept. 



10. Chamaesyce glyptosperma (Engelm.) 

 Small. Ridge-seeded Spurge. Fig. 2741. 



Euphorbia glyptosperma Engelm. Bot. Mex. Bound. 



Surv. 187. 1859. 

 C. glyptosperma Small, Fl. SE. U. S. 712. 1903.. 



Annual, pale green, glabrous. Stem branched 

 toward the base, the branches ascending, spreading 

 or prostrate, 2'-i5' long; leaves oblong, linear- 

 oblong or rarely ovate, i"-6" long, more or less 

 falcate, obtuse at the apex, inequilateral, serrulate, 

 very oblique and obtuse or subcordate at the base, 

 short -petioled ; stipules becoming a fringe of setae ; 

 involucres solitary in the axils, often clustered, 

 campanulate, 4" long, with 4 dark ribs and 4 saucer- 

 shaped glands, their appendages narrow, crenulate, 

 or slightly lobed ; capsule depressed-globose, less 

 than i" in diameter, nodding; seeds oblong, \" long, 

 ash-colored, strongly transversely wrinkled, not 

 pitted. 



In sandy soil, Ontario to British Columbia, Maine, 

 southeastern New York, Wisconsin, Iowa, Texas and 

 Mexico. June-Oct. 



ii. Chamaesyce stictospora (Engelm.) 

 Small. Narrow-seeded Spurge. Fig. 2742. 



Euphorbia stictospora Engelm. Bot. Mex. Bound. Surv. 

 187. 1859. 



C. stictospora Small, Fl. SE. U. S. 714. 1903. 



Annual, yellowish green, pilose throughout. Stem 

 branched from the base, the branches ascending, or 

 radiating, 2 f -\2 f long; leaves oblong to suborbicular, 

 2"-3" long, obtuse, dentate-serrate at the apex, 

 short -petioled, the bases truncate or subcordate; 

 stipules fringed; involucres clustered, campanulate, 

 \" high, with 4 cup-shaped glands subtended by in- 

 conspicuous crenate appendages ; peduncles at length 

 longer than the involucres ; capsule ovoid, i"-i" in 

 diameter; seeds narrowly ovoid, \" long, pointed, 

 pitted, gray or ash-colored, sharply 4-angled. 



Plains, hills and prairies, South Dakota to Nebraska, 

 Kansas, Colorado and Mexico. June-Oct. 



