376 EUPHORBIACEAE. [Vor.. II. 
16. Euphorbia marginata Pursh. White-margined Spurge. (Fig. 2322.) 
sch sh Sool marginata Pursh, Fl. Am. Sept. 607. 
1814. 
Annual, bright green, glabrous or pubescent. 
Stem rather stout, erect, 10’-3° tall, somewhat 
channelled, usually pilose, topped by a mostly 
3-rayed umbel; leaves except the whorl subtend- 
ing the umbel, scattered, ovate to obovate, 10’”— 
314’ long, entire, sessile, rays of the umbel 
forked; bracts large, white-margined; involu- 
cres campanulate, often clustered, 2/’ long, 
usually pubescent, bearing 3 glands subtended 
by white reniform appendages; capsule de- 
pressed-globose, 3/’ in diameter, usually pubes- 
cent, the lobes rounded; seeds ovoid-globose, 
terete, about 2’” long, dark ash-colored, reticu- 
late-tuberculate. 
In dry soil, Minnesota to Colorado, south to 
Texas. Introduced into waste places in the Central 
and Atlantic States. May-Oct. 
17. Euphorbia cuphospérma (Engelm. ) 
Boiss. Warty Spurge. (Fig. 2323.) 
Euphorbia dentata var. cuphosperma Engelm. Bot. 
Mex. Bound. Surv. 190. 185 
9- 
Euphorbia cuphosperma Boiss. in DC, Prodr, 15: Part 
2,73. 1862. 
Annual, usually sparingly pubescent. Stem erect, 
slender, simple, or sparingly branched, 8’—15/ high. 
Leaves opposite or alternate, linear, oblong, or 
linear-lanceolate, 10’’-3’ long, entire, undulate, or 
denticulate, narrowed into a slender petiole; in- 
volucres crowded at the ends of the branches, nearly 
sessile, glabrous, or nearly so, nearly 2’’ long, bear- 
ing about 4 long-stalked unappendaged glands; 
capsule glabrous, or sparingly pubescent, 2%’ in 
diameter, seeds narrowly ovoid, about 114’ long, ir- 
regularly 4-angled, ridged and slightly tuberculate. 
South Dakota to Colorado and Mexico. Aug.—Sept. 
18. Euphorbia dentata Michx. 
Toothed Spurge. (Fig. 2324.) 
Euphorbia dentata Michx. Fl. Bor, Am, 2: 211. 
1803. 
Annual, dull green, pubescent. Stem erect 
or ascending, 8/-15’ high, somewhat woody 
below, branched, the branches mostly ascending; 
leaves opposite, or the lowest alternate, varying 
from ovate to nearly linear or orbicular-oblong, 
5/’/-3%4’ long, coarsely dentate, narrowed into 
slender petioles, the nerves prominent beneath; 
involucres clustered at the ends of the branches, 
oblong-campanulate, about 114’ long, 3-5-lobed, 
bearing 1-4 yellowish short-stalked glands with- 
out appendages; capsule glabrous, 2//-232// in 
diameter; seeds ovoid or ovoid-globose, ash- 
colored, irregularly tuberculate, inconspicuously 
4-angled. 
In dry or moist soil, Pennsylvania to South 
Dakota, Louisiana and Mexico, July-Oct. 
