80 



EUPHOEBIACEAE. 



length : capsule 10-16 cm. long, bristly. — Pinelands and sand-dunes, U. S. keys, 

 U. keys, L. keys. — [E. K.] — Spurge-nettle. Tread-softly. 



15. JATROPHA L. Herbs or partially ■noody plants. Leaf -blades angled 

 or lobed. Flowers monoecious, petaliferous. Staminate flowers with 5 sepals, 

 5 small petals and 10 stamens. Pistillate flowers with a mainly 2-3-celled 

 ovary. Fruit a capsule. 



Jf-ZY'l. J. gossypiifolia L. Perennial, 5-11 dm. tall: leaf-blades palmately 3-5- 

 lobed, S-15 cm. wide, the lobes broad, shallowly toothed and glandular-ciliate : 

 cymules paniculate: jjetals scarcely twice as long as the sepals: capsules globu- 

 lar-oblong, about 1 cm. long, slightly warty: seeds 7-8 mm. long. — Eoadsides 

 and edges of hammocks, Key West. Nat. of the tropics. — {Bah., Cuba, Ant.) 



16. MANIHOT Adans. Herbs or shrubs. Leaf -blades entire or palmately 

 lobed, or parted. Flowers in racemes. Staminate flowers with 5 sepals 

 and 10 stamens. Pistillate flowers often smaller than the staminate, with a 

 3-celled ovary. 



j;'/-^ 1. M. Manihot (L.) Karst. Plants 9-16 dm. tall or more: leaf -blades 3-7- 

 parted: capsules with crenate-undulate wings. — Pinelands and cultivated 

 grounds, U. keys. Nat. of S. Am. — [E. K.] — {Ber., Bah., Cuba, Ant.) — 



Cassava. 



17. CHAMAESYCE S. F. Gray. Annual or perennial herbs or shrubs. 

 Leaves opposite: blades oblique at the base. Involucres axillary or in axillary 

 cymes, each with 4 naked or appendaged glands, one sinus being glandless. 

 Capsules smooth, sometimes pubescent. Seeds smooth or transverse-wrinkled. 

 —Spurge. 



Leaf-blades entire. 



Plants with prostrate stems and branches. 

 Plants annual or biennial. 



Seeds about 2 mm. long : capsule over 2 mm. long. 1. C. IngaUsii. 

 Seeds less than 1.5 mm. long: capsule less than 2 

 mm. long. 

 Capsules glabrous : stem and branches glabrous, 

 sometimes glaucescent. 

 Larger leaf-blades mostly oblong to ovate- 

 oblong: involucre about 1.5 mm. long. 2. C. Chiogenes. 

 Larger leaf-blades mostly suborbicular : invo- 

 lucre about 1 mm. long. 3. G. serpms. 

 Capsules pubescent : stem and branches canes- 

 cent or puberulent-canescent. 

 Leaf-blades of an oval or ovate type : branches 



not filiform, canescent. 4. C. Garberi. 



Leaf-blades of a deltoid or triangular type : 



branches filiform, puberulent-canescent. 5. G. Serpyllum. 



Plants with erect or ascending stems and branches. 

 Involucre 1.5-2 mm. long : capsules glabrous. 



Twigs and leaves succulent : beach-plant. 6. C buxifolia. 



Twigs and leaves not succulent : pineland-plant. 7. C. scopariu. 



Involucre about 1 mm. long : capsules pubescent. 8. G. adicioides. 



Leaf-blades toothed. 

 Capsule glabrous. 



Stem and branches prostrate. 9. G. Dlodijettii. 



Stem and branches erect or ascending. 



Seeds red or brown : capsules with rounded lobes. 10. C. hypericifoUa. 



Seeds gray : capsules with sharp lobes. 11. C. brasiliensia. 



Capsule pubescent. 



Stem and branches erect or ascending. 12. G. Tracyi. 



Stem and branches prostrate. 



Involucres axillary, sometimes approximate on lat- 

 eral branches : pineland-plnrts. 13. C.ddrnoptera. 

 Involucres in peduncled clusters : hammock plants. 

 Plants erect or ascending : involucre glands long- 

 stalked. 14. C. hirta. 

 Plants prostrate: involucre glands short-stalked. 15. O. ncmrlhi. 



