646 EUPHORBIACEJS. 



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

 ing stigmas. Florida and westward, on damp earth. February and March. 

 C. Austinii, Engelm. Smaller (!' or less long) ; fruit short-pediceHed, 

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

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

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



ORDER EUPHORBIACE^E. 



EUPHORBIA, L. 



E. mercurialina, Michx. Perennial, s.mooth; 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 with white (fruit not seen). Crevices of rocks 

 on Lookout Mountain, Tennessee. April. Stem 4' -6' high. Lea vest- 

 s'' long. 



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

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

 horiTed ; 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, Engelm.) Alabama (Buckley), and westward. 

 Stem 8' -12' high. 



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

 widely branching; leaves oval or obovate, oblique, entire, short-petioled; 

 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, Nutt.) South 

 Florida, Mississippi, and westward. 



E. ainmannioides, 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 



