80 



EUPHOEBIACEAE. 



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

 U. keys, L. keys, — [E. K.] — Spurge-nettle. Tre^vd- softly. 



15. JATROPHA L. Herbs or partially woody 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. 



1. 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: petals 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. 



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. 

 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 ].."> mm. long. 

 Larger leaf-blades mostly suborbicular : invo- 

 lucre about 1 mm. long. 

 Capsules pubescent : stem and branches canes- 

 cent or puberulent-canescent. 

 Leaf-blades of an oval or ovate type : branches 



not filiform, canescent. 

 Leaf-blades of a deltoid or triangular type : 

 branches filiform, puberulent-canescent. 

 Plants with erect or ascending stems and branches. 

 Involucre 1..5-2 mm. long : capsules glabrous. 

 Twigs and leaves succulent : beach-plant. 

 Twigs and leaves not succulent : pineland-plant. 

 Involucre about i mm. long : capsules pubescent. 

 Leaf-blades toothed. 

 Capsule glabrous. 



Stem and branches prostrate. 



Stem and branches erect or ascending. 



Seeds red or brown : capsules with rounded lobes. 

 Seeds gray : capsules with sharp lobes. 

 Capsule pubescent. 



Stem and branches erect or ascending. 

 Stem and branches prostrate. 



Involucres axillary, sometimes approximate on lat- 

 eral branches : i)iii(>lan(lplaiits. 

 Involucres in peduncled clusters : hammock plants. 

 Plants erect or ascending : involucre glands long- 

 stalked. 

 Plants prostrate : Involucre glands short-stalked. 



1. C IiKjaUsii. 



2. C. Chiogenes. 



3. C. serpens. 



4. C. Garhcri. 



5. C. Scrpyllutn. 



6. C. iuxifolia. 



7. C. scoparia. 



8. C. adicioides. 



n. C. Bloduettii. 



10. C. hypericifoUa. 



11. C. brasiliensis. 



12. C. Tniriii. 



13. C. udviiuptera. 



14. C. hirtn. 

 1.^. C. (]cmeUa. 



