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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. Hederacese. 
7. Cissoides. 
8. Tyrianthinae. 
III. BATATAS. 
Stems prostrate or creeping, not twining. 9. 
Steins trailing or twining, at least the tips twining. 
Seeds with dorsal or marginal coma longer than the seed or 
completely covered with long hairs (Eriospermse )} 
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. 12. 
Inflorescence cymose, paniculate or the flowers soli¬ 
tary; seeds with dorsal or marginal hairs only. 
Leaf-blades deeply 5-lobed. 13. 
Leaf-blades entire or 3-lobed, rarely 5-lobed. 14. 
Seeds glabrous or pubescent, at least without a conspicuous 
coma* (Lciospermae). 
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. 
Erpipomoea. 
Dactylophyllae. 
Setosas. 
Bombyco sperm S3. 
Palmatse. 
Jalapse. 
Pedatisectae. 
Microsepalas. 
Emeticse. 
Anisomeras. 
Aequisepalae. 
Section I. ORTHIFOMCEA. 
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 Leiospermce. 
