594 FLORA. 



djameter; seeds ovoid, smooth, sparingly pitted. In dry soil, Mass, and Ont. to 

 Minn, and Kans., south to Fla. and Tex. April-Oct. 



19. Euphorbia mar^inata Pursh. WHITE-MARGINED SPURGE. (I. F. f. 

 2322.) Bright green. Stem 2.5-9 dm. tall, usually pilose, topped by a mostly 

 3-rayed umbel; leaves, except the whorl subtending the umbel, scattered, ovate to 

 obovate, 2-8 cm. long, entire; bracts large, white-margined; involucres campanu- 

 late, often clustered, 4 mm. long, bearing 3 glands subtei.ded by white reniform 

 appendages; capsule depressed globose, 6 mm. in diameter; seeds ovoid- globose, 

 terete, dark ash-colored, reticulate-tuberculate. In dry soil. Minn, to Colo, and 

 Tex. Introduced into waste places in the Central and Atlantic States. May-Oct. 



20. Euphorbia cuphospsrma (Engelm.) Boiss. WARTY SPURGE. (I. F. f. 

 2323.) Dull green. Stem 2-4 dm. high; leaves opposite or alternate, linear, ob- 

 long, or linear-lanceolate, 2-8 cm. long, entire, undulate, or denticulate; invo- 

 lucres crowded at the ends of the branches, glabrous, or nearly so, nearly 4 mm. 

 long, bearing about 4 unappendaged glands; capsule 5 mm. in diameter; seeds 

 narrowly ovoid, about 3 mm. long, irregularly 4-angled, ridged and' slightly tuber- 

 culate. S. Dak. to Colo, and Mex. Aug. -Sept. 



21. Euphorbia dentata Michx. TOOTHED SPURGE. (I. F. f. 2324.) Dull 

 green. Stem 2-4 dm. high, the branches mostly ascending; leaves opposite, or 

 the lower alternate, ovate to nearly linear or orbicular- oblong, 1-8 cm. long, 

 coarsely dentate, the nerves prominent beneath; involucres clustered at the ends 

 of the branches, oblong campanulate, about 3 mm. long, 3~5-lobed, bearing 1-4 

 yellowish glands; capsule 4-5 mm. in diameter; seeds ovoid or ovoid- globose, 

 ash-colored, irregularly tuberculate, inconspicuously 4-angled. In dry or moist 

 soil, Penn. to S. Dak., Tenn., La. and Mex. July- Oct. 



22. Euphorbia Ipecacuanhae L. WILD IPECAC. IPECAC SPURGE. (I. F. f. 

 2325.) Root deep. Stems several or many, slender, 12.5 dm. l n g? leaves green or 

 red, wonderfully variable in shape from linear to orbicular, 17 cm. long, mostly 

 opposite, entire, short-petioled; involucres axillary, mostly hemispheric, nearly 2 

 mm. long, slender-peduncled, bearing 5 transversely elliptic or oblong green 

 glands; capsule 3 mm. in diameter; seeds light gray, oblong-ovoid or ovoid, pitted, 

 obscurely 4-sided. In dry sandy soil, Conn, to Fla., mostly near the coast. Also 

 in southern Ind. An emetic. Majs-Oct. 



23. Euphorbia heterophylla L. VARIOUS-LEAVED SPURGE. (I. F. f. 2326.) 

 Bright green. Stem 39 dm. tall, with the branches ascending, or the lower 

 spreading, leafy at the ends; leaves alternate, very variable, linear to orbicular, 

 entire, undulate, sinuate or dentate, the uppermost often fiddle-shaped and blotched 

 with red; involucres clustered at the ends of branches, 3 mm. long; lobes 5, ovate 

 or oblong, laciniate, the sinuses bearing I or several sessile glands; capsule gla- 

 brous or minutely pubescent, 6 mm. in diameter; seeds oblong-ovoid, tranversely 

 wrinkled and tuberculate. 111. to M ->nt. , Fla. and Trop. Am. April-Nov. 



24. Euphorbia Lathyris L. CAPER OR MYRTLE SPURGE. (I. F. f. 2327.) 

 Glaucous. Stem 2-10 dm. tall, mostly simple below, umbellately branched above; 

 leaves numerous, the lower scattered, linear, reflexed, those subtending the umbel 

 verticillate, the upper lanceolate or linear-lanceolate, entire, sessile, subcordate 

 at the base; bracts ovate or ovate-lanceolate, truncate or subcordate; involucres 5 

 mm. long, bearing 4 crescent-shaped glands prolonged into short horns; capsule 

 subglobose, 10-12 mm. in diameter; seeds oblong-ovoid, terete, usually wrinkled. 

 In waste places, Conn, to N. Car. Also in Cal. Native of Europe. May-Aug. 



25. Euphorbia Darlingtonii A. Gray. DARLINGTON 's SPURGE. (I. F. f. 

 2328.) Dark green, often minutely pubescent. Stem stout, 4-15 dm. tall, topped 

 by a 5-8-rayed umbel, branched above; leaves oblong or oblanceolate, 3.5-10 cm. 

 long, mostly obtuse, sessi le, often undulate, those of the stem scattered, those sub- 

 tending the umbels verticillate; bracts ovate or nearly reniform; involucres cam- 

 panulate, nearly 4 mm. long, bearing 5 reniform crenulate glands; capsule 

 depressed-globose, minutely warty; seeds ovoid-globose. N. Y., Penn. and N. J. to 

 N. Car. May- Sept. 



26. Euphorbia obtusata Pursh. BLUNT-LEAVED SPURGE. (I. F. f. 2329.) 

 Yellowish green. Stem 3-6 dm. high, topped by a 3-rayed umbel; branches 

 simple or forked; leaves scattered, spatulate-oblong, obtuse, serrulate to below the 

 midd'ej involucres I mm. long, bearing 4 stalked glands; capsule subglobose, 



