Voi,. II.] 



SPURGE FAMILY. 



373 

 (Fig. 2313.) 



7. Euphorbia glyptosperma Engelm. Ridge-seeded Spurge. 



Euphorbia glyptosperma Engelm. Bot. Mex. Bound. 

 Surv. 187. 1859. 



Annual, pale, green, glabrous. Stem branched 

 toward the base, the branches ascending, spread- 

 ing 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, %" long, with 4 

 dark ribs and 4 saucer-shaped glands, their ap- 

 pendages narrow, crenulate, or slightly lobed; 

 capsule depressed-globose, less than \" in diame- 

 ter, nodding; seeds oblong, %" long, ash-colored, 

 strongly transversely wrinkled, not pitted. 



In sandy soil, Ontario to British Columbia, south 

 to Connecticut, Texas and Mexico. June-Oct. 



8. Euphorbia maculatal,. Milk Purslane. 

 Spotted or Blotched Spurge. (Fig. 2314. ) 



Euphorbia macula/a L. Sp. PI. 455. 1753- 



Annual, dark green, puberulent or pilose. 

 Stem branched from the base, the branches slen- 

 der, radiately spreading, prostrate, 2 / -i5 / long, 

 often dark red ; leaves usually blotched, oblong or 

 ovate-oblong, 2 // -8 // long, obtuse, more or less 

 serrate, short-petioled, the base oblique, subcor- 

 date; stipules a fringe of setae; involucres solitary 

 in the axils, entire, l /i." long, with 4 cup shaped 

 glands, the appendages narrow, white or red, cren- 

 ulate; peduncles shorter than the involucres; cap- 

 sule ovoid-globose, about i" in diameter, pubes- 

 cent; seeds ovoid-oblong, obtusely angled, ash-col- 

 ored, minutely pitted and transversely wrinkled. 



Throughout North America, except the extreme 

 north. Apparently introduced west of the Rocky 

 Mountains. June-Nov. 



9. Euphorbia humistrata Engelm. Hairy Spreading Spurge. (Fig. 2315.) 



Euphorbia humistrata Engelm. ; A. Gray, Man. Ed. 

 2, 386. 1856. 



Annual, light green, puberulent or sparingly 

 pilose. Stem branched from the base, the slen- 

 der branches radiately spreading, prostrate or 

 ascending, 4 / -i2 / long; leaves ovate-oblong or 

 obovate-oblong, or sometimes narrower, 2 // -7 // 

 long, serrulate, at least above the middle, 

 oblique, obtuse or subcordate at the base, short- 

 petioled; stipules at length fringed; involucres 

 in lateral clusters, split on one side, y 2 " long, 

 faintly nerved, with 4 disk-like glands, each 

 subtended by a narrow irregular red or white 

 appendage; capsule depressed-globose, less than 

 i" in diameter, its 3 lobes keeled; seeds oblong, 

 Yz" long, papillose, ash-colored, obscurely trans- 

 versely wrinkled. 



Quebec to New York, Kansas and Mississippi. 

 Aug. -Oct. 



