108 



EUPHOEBIACEAE. 



15. JATROPHA L. Herbs or partially woody plauts. Leaf-blades 

 angled or lobed. Flowers in forked ejTiies. Staminate flowers with 5 sepals, 

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



1. J. multifida L. Perennial, 9-20 dm. tall: leaf -blades palmately 9-11-lobed, 

 mostly 10-20 cm. wide, the lobes narrow, entire or incised: cymules corymbose: 

 petals thrice as long as the sepals, scarlet: capsules globose-obovoid, 2.5-3 cm. 

 long, smooth. — Pinelands. Nat. of Trop. Am., and cultivated. — (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. Nat. from S. Am., and cultivated. — F. K. (Ber., Bah., Cuba, A7it.) 

 — 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 lu-anches. 

 Plants annual or biennial. 



Seeds over 1..") mm. lung: capsule glabrous. 

 Seeds less than ].."> mm. long: capsule pubescent. 

 Stem and branches finely canescent. 

 Stem and branches hirsute or villous-hirsute. 

 Larger leaves with oblong or ovate blades. 

 Larger leaves with deltoid or reniform blades. 

 Plants perennial. 

 Plants with erect or ascending stems and branches. 



Involucre l.,5-2 mm. long: seeds fully 1 mm. long: 



stems succulent. 

 Involucre 1 mm. long: seeds less than 1 mm. long: 

 stems wiry. 

 Leaf-blades toothed. 

 Capsule glabrous. 



Stem and branches prostrate. 



Sfem and branches erect or ascending. 



Leaf-blades linear or narrowly linear-lanceolate. 

 Leaf-blades broader. 



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 : pineland plants. 

 Involiioro deeply spilt on on(> side. 

 Involucre not split on one side. 



Glands of the involucre with inconspicuous 



appendages. 

 Glands of the involucre with petal-like ap- 

 pend.'igps. 

 Involucres in peduncled clusters : hammock plants. 

 Plants erect or ascending : involucre glands long- 

 stalked. 

 Plants prostrate : involucre glands sliort-stalked. 



I. ('. Iiinallxii. 

 2. C Garhcrl. 



•S. C hrochiipnda. 



4. C. pinrlontm. 



5. C. (Icltoidra. 



G. ('. hiixifolia. 



7. C. Pnrtrriana. 



8. C. BlodfjrttU. 

 0. C. hyssopifoUa. 



10. C. In/pcricifoHa. 



I I. r^ bra sinensis. 



I'J. C. Traci/l. 



\?,. C. prrf/aviDio. 



14. 0. cniifrrta. 

 1 ."i. C (idcnnpirra. 



1 0. <J. hirta. 

 \ 7. G. oemella. 



1. C. Ingallsii Small. Leaf-blados oldong to ovate-oblong, fleshy: involucre 

 between 1 and 1.-^ mm. long: capsules depressed: seeds broailly ovoid or 

 globose-ovoi<l, less than 2 mm. long. — Coastal sand-dunes. 



