E UPHORBIA CEA E. 595 



nearly 4 mm. in diameter, with elongated warts ; seeds oblong, or orbicular-oblong, 

 dark brown, faintly reticulated. In dry soil, Va. to Iowa, S. Car. and Tex. 

 March-July. 



27. Euphorbia platyphyUla L. Broad-leaved Spurge. (I. F. f. 2330.) 

 Bright green. Stems 1-5 dm. high, often reddish, topped by a usually 5 -rayed 

 umbel; leaves scattered, oblong or spatulate-oblong, 2-3 cm. long, acute, serrulate, 

 slightly auricled; bracts triangular-ovate or reniform, mucronate; involucres cam- 

 panulate, nearly 2 mm. long, bearing 4 glands; capsule subglobose, about 4 mm. 

 in diameter, with depressed warts; seeds oblong or nearly orbicular, smooth, 

 brown. Along the shores of the St. Lawrence River and the Great Lakes. Nat. 

 from Europe. June-Sept. 



28. Euphorbia Arkansana Engelm. Arkansas Spurge. Olive green. 

 Stem slender, 2-5 dm. tall, with few spreading branches above, topped by an umbel 

 with 3 copiously dichotomous rays 2-3 cm. long; stem-leaves cuneate or spatu- 

 late. 1-3 cm. long, rather acute, serrulate above the middle; bracts ovate to tri- 

 angular-ovate, 0.5-2 cm. long, truncate or subcordate at the base, mucronate at the 

 apex; involucres about 1 mm. high, with transversely elliptic glands less than 



1 mm. wide, the lobes usually ciliate; capsules 2.5-3 mm. wide, warty; seeds 

 ovoid, closely reticulated, brown. Dry soil, Mo. to Colo., Ala. andMex. May- Aug. 



29. Euphorbia Missouriensis (Norton) Small. Reticulate - seeded 

 Spurge. (I. F. f. 2331.) Olive green. Stem 3-6 dm. high, topped by a com- 

 pound 3-rayed umbel; leaves scattered, spatulate, 2-3.5 cm - l° n g; obtuse, serrate to 

 below the middle, the upper slightly auricled at the base ; bracts oblong or ovate, 

 inequilateral, acute, serrate; involucres less than 2 mm. long, with 4 oblong 

 glands, the lobes glabrous; capsule 3-3.5 mm. in diameter, with elongated warts; 

 seeds ovoid, purplish brown, distinctly reticulated. [£. Arkansana var. Missouri. 

 ensis Norton. E. dictyosperma 111. FL, not F. & M.] Minn, to Wash., south to 

 Kans. and N. Mex. May-Aug. 



30. Euphorbia Helioscopia L. Sun Spurge. Wartweed. (I. F. f. 

 2332.) Bright green. Stem 1-3 dm. tall, often branched from the base, topped 

 like the branches by a more or less compound 3-5 -rayed umbel; leaves scattered, 

 spatulate, obovate, oblong, or sometimes nearly orbicular, 1-12 cm. long, obtuse or 

 retuse. serrulate, short-petioled; bracts oblong or ovate, serrulate, inequilateral; 

 involucres oblong-campanulate, 2.5 mm. long, usually with 4 oblong stalked glands; 

 capsule globose-ovoid, or somewhat depressed, 4 mm. in diameter, smooth, the 

 lobes rounded; seeds ovoid, nearly 3 mm. long, reddish brown, strongly reticulate. 

 In waste places in the Valley of the St. Lawrence and along the Great Lakes, 

 extending south to N. H., N. Y. and Ohio. Nat. from Europe. June-Oct. 



31. Euphorbia Peplus L. Petty Spurge. (I. F. f. 2333.) Olive green. 

 Stem 1-3 dm. high, topped by a 3-5-rayed umbel; stem-leaves scattered, oblong or 

 obovate, 1-3 cm. long, obtuse or retuse, entire, slender-petioled ; bracts opposite, 

 ovate or triangular-ovate, apiculate, sessile; involucres campanulate. less than 



2 mm. long, bearing 4 crescent-shaped glands prolonged into slender horns ; cap- 

 sule globose-ovoid, 2-3 mm. in diameter, slightly nodding, smooth, the lobes 

 2-keeled; seeds oblong or oblong-ovoid, whitish, nearly terete, marked with 1-4 

 series of pits. In waste places, western N. Y. to N. J. and Penn. Adv. from 

 Europe. June-Sept. 



32. Euphorbia commutata Engelm. Tinted Spurge. (I. F. f. 2334.) 

 Yellowish green, often tinged with red. Stem usually decumbent, 1-4 dm. long, 

 topped by a 3-rayed umbel; branches forked or umbellately branched; leaves 

 scattered, spatulate to ovate. 1.2-3.5 cm. long, obtuse or mucronulate, entire, 

 slender-petioled; bracts ovate-reniform ; involucres campanulate, 2.5 mm. long, 

 bearing 3 or 4 crescent-shaped glands prolonged into slender horns; capsule globose- 

 ovoid, 3 mm. in diameter, glabrous, the lobes rounded; seeds oblong, terete, irreg- 

 ularly pitted. On hillsides, Penn. to Minn., Fla. and Mo. March-July. 



33. Euphorbia Esula L. Leafy Spurge. Faitour's Grass. (I. F. f. 

 2 335-) Bright green. Stems often clustered, mostly erect, 2-6 dm. tall, topped 

 by a many-rayed umbel; leaves few, all scattered, linear or oblong, 1.4-4 cm. 

 long, 4-12 mm. broad, entire, those subtending the umbel lanceolate or oblanceo- 

 late; bracts subreniform, mucronate; involucres campanulate, 2.5-3 mm. long, 



