388 ECPHORBIACEjE. (SPURGE 



# # G kinds of the involucre entire, not appendaged : involucres nearly sessile. 

 - Seeds rugose or reticulated : leaves serrulate : annuals. 



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

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

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

 ular, stalked ; j>od 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. ArkaiiSana, Engelm. & Gr. Slender, very smooth throughout; 

 Kern-leaves oblong- or obovate-spatutate, those of the flowering branches roundish-ovate 

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

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

 Kentucky (Short), and south westward. 



*- *- 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, 

 Amcr. auth. & cd. 1.) 00 ? Shady fertile woods, <fcc., Virginia to Illinois 

 and southward. July -Sept. 



13 a . JE. platypliylBa, L. Differs from E. obtusata in having the 

 upper leaves acute, the tipper bracts cuspidate, the styles 2-lobed at the apex 

 only, and much longer than the ovary, which is warty with hemispherical 

 glands. Niagara Falls, Vermont, <fec. (]S"a". from Eu.) 



14. E. Dai'Iillgtonii, Gfray. 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. 1J. (E. nemoralis, DarL, not of Kit.) Copses, &c., Penn. and south 

 ward along the mountains. 



* # # Glands of the involucre crescent-shaped or 2-horned, naked. (Stems erect, 



leaves entire : plant glabrous. ) 

 +- Seeds smooth, blackish or dull : perennials, icith rnnnhig rootstocks. 



15. E. ESULA, L. Stems clustered (lhigh); leaves lanceolate or lincai , 

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

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

 honifd (brown) ; pods srnoothish. Essex County, Massachusetts, Oakes: likely 

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



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

 ('-!' high); sit'in-l<an-s linear, crowded, the floral ones heart-shaped; umbefc 

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

 tha/>ed ; pods granular. Escaped from gardens to road-sides, n a few places 

 in New England. (Adv. from Eu.) 



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



