73. CBHATOPHrLlAOE^. 317 



ened rougli keels, seeds ovoid pitted.—^. B. 959. — ^Light green, 

 smooth, erect, 6—10 in. high. — A common weed. A. VII. VIII. 

 Petty Spurge. E. S. I. 



13. E. exig'ua (L.) ; umbel of 3 forked rays, hraots lanceolate 

 acute uueijual below, I. linear blunt with a mucro or acute, iuv.- 

 lobes rounded with 2 horns, caps, smooth with slightly thick- 

 ened and tubercled angles, seeds angular wrinkled. — E. B. 

 138B. — Height 3 — 6 in., usually branched at the base. Seeds 

 small, white.— Cornfields. A. VT.— VIII. E. S. I. 



tttt Seeds rough. Leaves opposite. 



14. E. Lath'yris (L.) ; umbel of 3 or 4 forked rays, bracts 

 oblong-ovate attenuate acute, 1. linear-oblong sessile, upper 1. 

 cordate at the base, inv.-lobes lunate with blunt horns, caps, 

 smooth with a dorsal line. — E. B. 2255. St. solitary, 2 — 3 feet 

 high, purplish. L. many, in 4 rows. — Truly wild in a few 

 stony and rocky woods, where it appears for 2 or 3 years after 

 the bushes have been cut. Also naturalized on cultivated 

 ground. B. VI. VII. Caper-Spurge. E. 



3. Merottria'lis Linn. Mercury. 



1. M. peren'nis (L.) ; st. simple, 1. stalked oblong-lanceolate 

 rough, female fl. on long common stalks, creeping. — E. B. 

 187^3. — St. a foot high, usually naked below. Fl. in lax spikes. 

 — fi. M. ovata (Steud.) ; 1. nearly sessile ovate. — Woods and 

 thickets. /S. Hurstpierpoint, Suss. Mr. Mitten. P. IV. V. 



E. S. I. 



2. M. an'nua (L.) ; St. branched, 1. stalked ovate or ovate-ob- 

 long smooth, female fl. nearly sessile, root fibrous. — E. B. 559. — ■ 

 Height 6 — 12 in. Bright green. Much branched. — /3. M. am- 

 hiqua (L.) ; 1. lanceolate, fl. whorled male and female intermixed. 

 E. B. 8. 2816.— Waste and cultivated land. A. VIII. IX. 



E.I. 



Order LXXIII. CERATOPHYLLACEiE. 



H. monceoious. Perianth free, in many divisions. Anth. 12 

 ■ — 20, sessile, 2-celled, 2-pointed ; cells again partially divided. — • 

 Perianth usually wanting. Ovary l-celled. Seed 1, pendulous. 

 Embryo straight ; cotyledons 4, alternately smaller. — No sti- 

 pules. — Only one genus. 



1. Cbeatophti'lttm lAnn. Homwoi't. 

 1. C. detnei-'sum (L.); segments of I. linear-aliform, fr. wing- 



