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ANNALS NEW YORK ACADEMY OF SCIENCES 



Leaf-blades entire or variously 3-lobed. 

 Leaf-blades palmately 5-divided. 

 Ovary typically 2-celled; blades often 3-lobed. 



6. Hederaceae. 



7. Cissoides. 



8. Tyrianthinae. 



III. BATATAS. 



Stems prostrate or creeping, not twining. 



Stems trailing or twining, at least the tips twining. 



Seeds with dorsal or marginal coma longer than the seed or 

 completely covered with long hairs (Eriospennse) .^ 

 Leaf-blades divided to the petiole into 3 to 9 stalked 



or sessile leaflets. 10 



Leaf-blades entire or, if lobed, not divided to the peti- 

 ole. 

 Pedicels thickened and fleshy, beset with tentacular 



outgrowths or setae. 11 



Pedicels not conspicuously thickened, neither tentac- 

 ular nor setaceous. 

 Inflorescence racemose, suberect or pendant; seeds 

 covered on all surfaces with long wool-like 

 hair. 

 Inflorescence cymose, paniculate or the flowers soli- 

 tary; seeds with dorsal or marginal hairs only 

 Leaf -blades deeply 5-lobed. 

 Leaf-blades entire or 3-lobed, rarely 5-lobed. 

 Seeds glabrous or pubescent, at least without a conspicuous 

 coma (Leiospermae). 

 Leaf-blades palmately or pedately lobed nearly or quite 

 to the petiole; stems slender. 15. 



Leaf-blades entire, toothed or 3- to 5-lobed. 



Sepals small, less than 5 mm. long. 16. 



Sepals larger, 6-20 mm. long, or longer. 



Sepals thin and membranaceous, mostly obtuse, un- 

 equal; roots enlarged and tuber-like, 17. 

 Sepals coriaceous; roots rarely tuber-like. 



Sepals very unequal. 18. 



Sepals equal or nearly so. 19. 



9. Erpipomoea. 



13. 

 14. 



Dactylophyllae. 



Setosse. 



12. Bombycospermse. 



Palmatse- 

 Jalapse- 



Pedatisectae. 

 Microsepalae. 



Emeticae. 



Anisomerae. 

 Aequisepalae. 



Section I. ORTHIPOMCEA. 



Erect, bushy, shrubby or tree-like perennials; leaf-blades rarely cordate 

 or lobed; often short -petioled ; corollas mostly large and showy; sepals 

 coriaceous or leathery; capsules thick-walled, often elongated; seeds with 

 long wool-like hair on the dorsal angles, or the angles long-hirsute. 



1 In cases where it has not been possible to determine with any certainty whether the 

 seeds are hairy or not, the species has been grouped with the Leiospermae. 



