496 ORDER CVIII. EUPHORBIACE^. 



6. Stamens 5 Crotonopsis, 7 



Stamens more than 5 T 



T. Perianth 3— 4-parted Acalypha, 4 



Perianth 5 or more parted 8 



8. Stamens 6, united Phyllanthus, 9 



Stamens more than 6 v 9 



9. Perianth funnel-shaped, petaloid Jatropha, 5 



Perianth not petaloid 10 



10. Leaves peltate, palmate Ricivus, 6 



Leaves undivided Croton, 8 



Genus I.— EUPHOR'BIA. L. 19—1. 

 (Named after Euphorbus, an eminent physician.) 



Monoecious. Involucre campanulate, 8 — 10-toothed, the 

 inner segments membranaceous and erect. Sterile florets, at- 

 tached to the inside of the involucre. Stamen 1. Filaments 

 articulated in the middle. Fertile florets solitary, central, stipu- 

 late, naked. Stigmas 3, 2-cleft. Capsule 3-lobed, 3-celled. 



1. E. crATHOPH'oRA, (Muif.) Somewhat shrubby, glabrous. Leaves 

 alternate, oblong, petiolate, slightly toothed, panduriform, the upper 

 ones red at the base. Flowers in terminal clusters. Involucre colored. 

 Capsule smooth, 3-celled. — ^ . Through the summer. 2 feet. 



2. E. graminifo'lia, (Mich.) Stem erect, branching from the base, 

 finely pubescent, small Leaves scattered, linear, entire. Floieers fas- 

 ciculate, terminal. — On the sea-coast of Geo. and Flor. 



3. E. hypericifo'lia, (L.) Ste)7i erect, branching ; spreading branches, 

 divaricate. Leaves opposite, oval-oblong, slightly falcate, serrate, 3- 

 nerved, spotted. Flowers in terminal corymbs, small. — ^. August — 

 Sept. Fields. 1—2 feet. 



4. E. macula'ta, (L.) Stem erect, spreading, or decumbent, dichoto- 

 mously branched, slightly pubescent, usually purple. Leaves opposite, 

 on short petioles, serrate, oblong, hair}^ 3-nerved, oblique at the base. 

 Flowers axillary, solitary, crowded near the summit, inner, segments of 

 the involucre colored, — ©. June — Oct. Cultivated lands. 2 — 3 ft. 



5. E. DEPREs'sA, (Torr.) Ste7Ji procumbent, pubescent, slender, 

 branches alternate. Leaves oval, opposite, slightly serrate, unequal at 

 the base, hairy beneath. Flowers solitary, axillary, clustered toward 

 the summit of the branches. Stipules 4 at each joint, plumose ; inner 

 segments of the perianth white, 4, small. — 0. Through the summer. 

 Cultivated lands. Very common. 8 — 12 inches. 



6. E. cordifo'lia, (Ell.) Stem prostrate, branching, glabrous, with 

 the branches alternate. Leaves unequal, and cordate at the base, oval, 

 entire, glabrous, small. Flowers solitary, axillary, surrounded at the 

 base with plumose stipules ; inner segments of the perianth white. — ^. 

 Through the summer. Cultivated lands. 8 — 15 inches. 



7. E. poltgonifo'lia, (L.) Stem, procumbent, branching, succulent, 

 glabrous. Leaves oblong-ovate, linear-lanceolate, entire, obtuse. Flow- 

 ers sohtary in the divisions of the stem. Stipules subulate, simple. — 

 If. July — ^Sept. Sandy soils. On the sea-shore. 8 inches. 



8. E. ipecacuan'h^, (L.) Stem procumbent or erect, small, glabrous. 

 Leaves sessile, varying in form from obovate lanceolate to linear, op- 



