294 OKDER 113. EUPHOHBIACE^E. 



volucre calyx-like, 4- or 5-lobed, often with 4 or 5 large glands. $ Fls. 

 9 or more, each a stamen with a bract. ? Flower central, a 3-celled, 3- 

 ovuled ovary on a pedicel. Styles 3, 2-clei't. Caps. 3-lobed, separating 

 into 3 nutlets. Plants with a milky juice. 



Shrubs of the greenhouse, with scarlet bracts or involucres Nos. 3335 



$ Herbs, erect, without stipules. Leaves alternate or opposite. . .(a) 

 Herbs, mostly prostrate, diffuse. Leaves all opposite, oblique at base, 

 small, furnished with small stipules at base. Glands of the involucre 



4, usually white-margined. (T) May Nov (x) 



a Glands of the involucre 5, bordered with white petaloid appendages.. .(&) 

 a Glands of the involucre 4 or 5, crescent-shaped or 2-horncd. . .(c) 

 a Glands of the involucre 15, neither white nor horned. . .(d) 



b Heads pedunculate. Branches regular. Leaves oblong to linear ..Nos. 1, 2 



b He&ds pedunculate. Branches irregular. Leaves oval or ovate Nos. 3, 4 



b Heads nearly sessile. Leaves with broad white margins . . .No. 5 



c Umbel of many rays. Stem leaves narrow, alternate. Seeds smooth, if. .. .Nos. 6, 7 



c Umbel of 3 rays, and forked. Stem leaves alternate, thin Nos. 8, 0, 10 



c Umbel of 3 or 4 rays, and forked. Stem leaves opposite, thick No. 11 



d Inflorescence a simple terminal cluster. Leaves toothed or lobcd....Nos. 12, 13 

 d Inflorescence a forked cyme, peduncles in the forks. Lvs. entire. . . .Nos. 14, 13 

 d Inflorescence a compound umbel. Heads terminal. . .(e) 



e Seeds reticulated or wrinkled. Leaves serrulate Nos. 16, 17 



e Seeds smooth and even, k in a rough, warty fruit Nos. 1820 



k in a smooth and even fruit Nos. 2123 



x Leaves serrulate or serrate. Seeds roughened with wrinkles or pits. . .(y) 



y Stems ascending or erect. Plants smooth or smoothish Nos. 24 26 



y Stems flat on the ground, spreading, mostly hairy Nos. 27, 28 



x Leaves entire. Seeds smooth and even. Plant glabrous Nos. 2932 



1 E. corollata L. Flowerings. Erect, glabrous, or subglabrous ; umbel 3-7-rayed, 

 rays 3- and 2-forked ; lv?. oblong to oblong-linear, obtuse, those of the umbel whorled 

 or opposite ; involucre glands obovate, petaloid. 24 Dry fields, 1 2f. July, Aug. 

 /3. aug-ust tfolia. Leaves oblong-linear ; umbel becoming irregular. S. 



X E. Curtisii Eng. Smooth, slender, branched from base, divisions about 3-forked, 

 then 2-forked; leaves opposite or in 3's, linear-oblong or linear ; heads minute ; in- 

 volucre glands narrowly white-bordered. 2f Barrens, S. If. (E. discoidalis Chapm.) 



3 E. pubeiitissima MX. Hairy, 2 or 3 times forked ; leaves oval or ovate-oblong, 



petiolate or subsessile, scattered, the floral much smaller ; heads minute ; involucre 

 glands minutely white-margined, entire. Dry. S. If. (E. paniculata Ell.) 



4 E. mercurial in a. MX. Stem naked below, leafy, and 3- or 2-forkcd above, pubes- 



cent . ; leaves oval or ovate, petiolate, mostly opposite; involucre lobes crenulatc, 

 white. Teun. : rare. 8 10'. Too near to the preceding. 



5 E. margiiiata Ph. Leaves lance-oblong, sessile, the floral crowded, and with a 



broad white margin ; umbel 3-raycd, capitate. (T) Ky., and W. If. t 



6 E. Cyparisslas L. Lvs. linear, much crowded, the floral broad-cordate, all sessile ; 



umbel of many simple rays ; glands lunate, it Fields and gardens. If. 



7 E. Esula L. Lvs. lance-linear, the floral broadly cordate ; umbel of many forked 



rays, and scattered branches below ; glands 2-horned. Fields : rare. 

 S E. .Peplus L. Leaves round-cuneate, the floral ovate ; umbel of 3 (rarely 5) forked 



rays : carpels doubly wing-keeled on the. back. Fields, N. Eng. : rare. Europe. 

 9 E. Oliiotica Steud. Smooth, erect from a decumbent branching base ; Ivs. mostly 



floral, rcniform, sessile, the pairs appearing orbicular ; carpels not winged ; glands 3 



toorncd. it Woods, Ohio, W. and S. If. (E. commntatA Eng.) 



