388 EUPHORBIACEJE. (SPURGE FAMILY.) 



* # Glands yf the imxducre entire, not appendaged : involucres 



+- Seeds rugose or reticulated : leaves serrulate : annuals. 



11. E. HELiosc6piA, L. (SuN SPURGE.) Leaves all obovate and very 

 rounded (or retuse) at the end, finely serrate, those of the stem wedge-shaped; 

 umbel divided into 5 rays, then into 3, or at length simply forked ; glands orbic- 

 ular, stalked; pod smooth and even. Waste places, east of the Alleghanies : 

 rather scarce. July -Sept. Rather stout, branched from the root, 6' -12' 

 high, smooth or a little hairy. (Nat. from Eu.) 



12. E. Arkansaiia, Engelm. & Gr. Slender, very smooth throughout; 

 stem-leaves oblong- or obovate-spatulate, those of the flowering branches roundish-ovate 

 or slightly heart-shaped, very obtuse ; umbels once or twice 3-forked, then 2- 

 forked; glands oval, almost sessile ; pod warty; seeds reticulated. Lexington, 

 Kentucky (Short), and southwestward. 



-- *- Seeds smooth and even : pod warty or rough. 



13. E. Obtusata, Pursh. (WARTED SPURGE.) Leaves all obtuse, mi- 

 nutely serrulate, smooth ; those of the stem oblong-spatulate, the uppermost and 

 bracts dilated-ovate and barely mucronate ; umbel once or twice divided into 

 3-5 rays, then into 2 ; glands oval ; styles 2-cleft to the middle, scarcely longer 

 than the ovary, which is warty with cylindrical projections. (E. platyphylla, 

 Amer. auth. Sf ed. 1.) (2) ? Shady fertile woods, &c., Vermont to Virginia, 

 and common westward. July - Sept. The representative of the European E. 

 platyphylla, which has the upper leaves acute, the upper bracts cuspidate, the 

 styles 2-lobed at the apex only, and much longer than the ovary, which is warty 

 with hemispherical glands. [The difference in the styles appears to be not 

 altogether constant.] 



14. E. Darlingtonii, Gray. Tall (2 -4 high); leaves entire, minutely 

 downy beneath ; those of the stem lanceolate-oblong, the lower floral ones oval, 

 very obtuse, the upper roundish-dilated with a truncate base ; umbel 5-8- 

 rayed, afterwards simply forked ; glands obliquely oval, sessile ; pod obscurely- 

 warty. }|- (E. nemoralis, DarL, not of Kit.) Copses, &c., Penn. and south- 

 ward along the mountains. 



* * # Glands of the involucre crescent-shaped or Z-horned, naked. (Stems erect : 



leaves entire: plant glabrous.) 

 H- Seeds smooth, blackish or dull : perennials, with running rootstocks. 



15. E* ESULA, L. Stems clustered (lhigh); leaves lanceolate or linear-, 

 the floral (yellowish) broadly heart-shaped, mucronate ; umbel divided into many 

 rays, then forking ; also with scattered flowering branches below ; glands short- 

 horned (brown) ; pods smoothish. Essex County, Massachusetts, Oakes: likely 

 to become a troublesome weed. June. (Adv. from Eu.) 



16. E. CypARfssiAS, L. (CYPRESS SPURGE.) Stems densely clustered 

 ('-!' high); stem-leaves linear, crowded, the floral ones heart-shaped; umbel 

 many-rayed, and with some scattered flowering branches below ; glands crescent- 

 shaped ; pods granulai . Escaped from gardens to road-sides, in a few places 

 in New England. (Adv. from Eu.) 



*- *- Seeds sculptured, ash-colored: root biennial or annual. 



