646 KUPHORUIACE^. 



gibbous, grooved around tlu- wingless margin, as long as the widely spread- 

 ing stigmas. — Tioridii and westward, on dan)p eartli. February and March. 

 C. Austinii, Engelm. Smaller (V or less long) ; fruit short -pedicelled, 

 flattened, wider than long, notched at both ends, with narrow denticulate 

 wings, longer than the spreading stigmas; otherwise like the preceding. — 

 Tennessee (Dr. GatUnger), and northward. April. 



Order EUPHORBIACE^. 



EUPHORBIA, L. 



E. mercurialina, Michx. Perennial, smooth ; stem erect, simple or 

 branching; leaves opposite, or three in a whorl, thin, oval, obtuse, entire, 

 nearly sessile ; flowers single, terminal, or in the forks of the stem, the seta- 

 ceous pedicels mostly longer than the leaves; lobes of the involucre bifid, 

 the glands broadly margined witii white (fruit not seen). — Crevices of rocks 

 on Lookout Mountain, Tennessee. April. — Stem 4' -G' high. Leaves 4"- 

 8" long. 



E. tetrapora, Engelm. Stem erect, umbellately branched ; leaves 

 wedge-shaped, obtuse or emarginate, the upper ones roundish ; glands 2- 

 horned ; capsule smooth, obtuse-angled ; inner face of the seed only 4-pitted. 

 — Georgia, and westward. 



E. dictyosperma, Fisch. & Meyer. Smooth ; stem umbellately 

 branched, slender, the branches forking ; leaves spatulate-obovate, serrulate 

 near the apex, of the branches cordate ; glands round ; capsule warty ; seeds 

 reticulate. (E. Arkansana, EiKjelm.) — Alabama {Bucllei/), and westward. — 

 Stem 8' -12' high. 



E. Garberi, Engelm. (ined.). Perennial, softly villous throughout; stems 

 widely branching; leaves oval or obovate, oblique, entire, shortpetioled; 

 stipules ciliate-laciniate ; flowers single in the upper axils ; glands narrowly 

 margined ; capsule acutely angled ; seeds reddish-brown, transversely 2- 

 ribbed. — Sandy coast. South Florida. — Stem 1° or more long. 



E. serpens, H.B.K. Smooth, small (4'-8' long); leaves round-ovate, 

 entire (^"-2" long); stipules triangular, toothed ; peduncles single; append- 

 ages of the gland minute or none; capsule smooth, acutely angled; seeds 

 smooth and even, obtusely 4-angled. (E. herniarioides, Xutt.) — South 

 Florida, Mississippi, and westward. 



E. ammannioides, H.B.K. Smooth throughout ; stems long (2° -3"^), 

 filiform, prostrate, alternately branched ; leaves oblong (2" -3" long), entire; 

 rounded and mucronate at the apex, short-petioled ; stipules 2-parted ; flowers 

 single, terminal, and in the forks of the branches ; glands margined with 

 white ; capsule obtusely triangular; seeds ovate, obscurely triangular, smooth 

 and even. — Roberts's Key in Caximbas Bay, South Florida. 



E. humistrata, Engelm. Prostrate, pubescent ; leaves elliptical or 

 obovate, oblique at the base, serrulate near the apex (4" -9" long) ; stipules 



