E UPHOKBIA CEA E. 593 



wrinkled. Throughout N. Am. except the extreme north. Apparently introduced 

 west of the Rocky Mts. June— Ni »v. 



ii. Euphorbia humistrata Engelm. Hairy Spreading Spurge. (I. F. f. 

 2315.) Light green, puberulent or sparingly pilose. Branches radiately pros- 

 trate, 1-3 dm. long; leaves ovate-oblong orobovate-oblong, or sometimes narrower, 

 4-15 mm. long, serrulate, at least above the middle, oblique, obtuse or subcordate 

 at the base; involucres in lateral clusters, split on one side, 2 mm. long, faintly 

 i.erved, with 4 disk-like glands, and narrow irregular red or white appendages; 

 capsule depressed-globose, less than 2 mm. in diameter, its 3 lobes keeled; seeds 

 oblong, papillose, obscurely transversely wrinkled. Quebec to N. Y., Kans. and 

 Miss. Aug. -Oct. 



12. Euphorbia stictospora Engelm. Narrow-seeded Spurge. (I. F. f. 

 2316.) Yellowish green, pilose. Branches radiating, 5-30 cm. long; leaves 

 oblong to suborbicular, 4-6 mm. long, obtuse, dentate -serrate at the apex, the bases 

 truncate or subcordate; involucres clustered, campanulate, 1 mm. high, with 4 

 cup-shaped glands, and inconspicuous appendages; capsule ovoid, 1-2 mm. in 

 diameter; seeds narrowly ovoid, pointed, pitted, gray or ash-colored, sharply 

 4-angled. S. Dak., Neb. and Colo, to Mex. June-Oct. 



13. Euphorbia Fendleri T. & G. Fendler's Spurge. (I. F. f. 2317.) 

 Pale green, glabrous. Branches wiry, 1-2 dm. long, brittle; leaves suborbicular, 

 oval or elliptic. 3-8 mm. long, obtuse, entire, the base oblique, obtuse or subcor- 

 date; involucres campanulate, 2-5 mm. high, with 4 or 5 saucer-shaped oval glands 

 and irregular appendages; capsule deflexed. 3 mm. in diameter, sharply 3-lobed; 

 seeds ovoid, wrinkled. Neb. and Colo, to Tex., Mex. and Ariz. April-Oct. 



14. Euphorbia lata Engelm. Hoary Spurge. (I. F. f. 2318.) Pale 

 green, canescent. Base somewhat woody; branches 5-10 cm. long; leaves ovate to 

 lanceolate. 5-10 mm. long, revolute, abruptly narrowed, truncate or cordate at the 

 base; involucres solitary in the axils, 1 mm. long, bearing 5 disk like glands and 

 narrow appendages; capsule subglobose, 2 mm. in diameter; seeds oblong, acutish 

 at both ends, 4-angled, the faces inconspicuously transversely wrinkled. Kans. to 

 Tex. and N. Mex. 



15. Euphorbia nutans Lag. Large or Upright Spotted Spurge. (I. F. 

 f. 2319.) Deep green. Stem 2-6 dm. high, the branches mostly spreading; leaves 

 opposite, oblong, or linear- oblong, varying to ovate or obovate, often falcate, 

 oblique. 3 -nerved, unequally serrate, often with a red blotch and red margins; 

 involucres narrowly obovoid, I mm. long, bearing 4 glands subtended by orbicular 

 orreniform white or red appendages; capsule glabrous, 2 mm. in diameter; seeds 

 oblong-ovoid, 4-angled, with broken transverse ridges. In fields and thickets, 

 throughout eastern N. Am. except the extreme north, extending west to the Rocky 

 Mts. May-Oct 



16. Euphorbia hexagdna Nutt. Angled Spurge. (I. F. f. 2320.) Yel- 

 lowish green. Stem striate angled. 1-5 dm. tall, the branches ascending, often 

 almost filiform; leaves opposite, linear, oblong or lanceolate, equilateral; involucres 

 solitary in the axils, often clustered, 2-3 mm. long, ciliate, pubescent, with 5 

 glands subtended by triangular-ovate whitish or green appendages; capsule gla- 

 brous, 4 mm. in diameter; seeds ovoid or oblong-ovoid, terete, papillose. Iowa to 

 Mont., Tex. and Colo. Also at Wilmington. Del. June-Oct. 



17. Euphorbia Marylandica Greene. Maryland Spurge. Perennial, 

 glabrous, pale green, glauce^cent. Stems trichotomous near the base, thence 

 bushy, 3-4 dm. tall, the branches dichotomous ; leaves linear to linear-lanceolate, 

 2-3.5 cm - l° n g- acute, opposite above the whorl of 3 at the first fork; involucres 

 hemispheric, nearly 2 mm. high; appendages white, suborbicular to reniform. On 

 sand hills, Anne Arundel Co., Md. Summer. 



18. Euphorbia corollata L. Blooming or Flowering Spurge. (I. F. f. 

 2321.) Perennial by a long stout rootstock. Stem erect, 2.5-9 dm. tall, umbel- 

 lately branched above; leaves linear, oblong or oblong-spatulate. 2-4 cm. long, 

 entire, short petioled or sessile, the lower scattered, those subtending the umbel ver- 

 ticillate; bracts ovate to linear, green; involucres mo-tly terminal, less than 2 mm. 

 long, bearing 4 or 5 yellowish green oblong glands subtended by white petal-like 

 cuneate or orbicular-cuneate appendages; capsule erect, subglobose, 2-4 mm. in 



