80 



EUPHORBIACEAE. 



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. JATEOPHA 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, 8-15 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. taU 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. Ingallsii. 

 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. Chiogcnes. 

 Larger leaf -blades mostly suborbicular : invo- 

 lucre about 1 mm. long. 3. C. serpens. 

 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. C. 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. scoparia. 



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



Leaf-blades toothed. 

 Capsule glabrous. 



Stem and branches prostrate. 9. C. Blodgettii. 



Stem and branches erect or ascending. 



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



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



Capsule pubescent. 



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



Stem and branches prostrate. 



Involucres axillary, sometimes approximate on lat- 

 eral branches : pineland-plants. 13. C. adenoptera. 

 Involucres in peduncled clusters : hammock plants. 

 Plants erect or ascending : involucre glands long- 

 stalked. 14. C. hirta. 

 Plants prostrate : involucre glands short-stalked. 15. C. gemella. 



