98 



House : North American Convolvulaceae 



on the dorsal angles, rarely pubescent or glabrous. Stigmas 

 capitately 2-lobed. 



Type species : Ipomoea bracteata Cav. 



The species, about 20 in number, are all confined to North 



America, 



Key to the species 



A. Inflorescence with conspicuous bracts. 



Bracts ovate-elliptical to linear-lanceolate. 

 Inflorescence long-peduncled. 

 Bracts 2-3 cm. long. 



Bracts elliptical-obovate, obtuse ; sepals 



obtuse. 

 Bracts linear-lanceolate ; sepals acuminate. 

 Bracts icm. long, green or tinged with red, sub- 

 herbaceous. 

 Inflorescence sessile or nearly so ; bracts linear-lance- 

 olate ; foliage velvety-pubescent. 

 Bracts reniform-ovate, acute, red ; inflorescence spicate. 



B. Inflorescence without conspicuous bracts. 



Leaf-blades silvery-canescent beneath. 



Leaf-blades cordate or subcordate at base. 



Corolla 5 cm. long ; leaf-blades silvery beneath, 



often 3lobed at the base. 

 Corolla 3 cm. long or less; leaf-blades sericeous 

 beneath, not lobed. 

 Leaf-blades not cordate ; corolla about 3 cm. long. 

 Corolla glabrous. Cuban. 

 Corolla pubescent. Mexican. 

 Leaf-blades neither silvery nor sericeous beneath. 

 Corolla salverform, scarlet ; leaf-blades entire, 



or 3-5 parted. 

 Corolla-limb not salverform. 



Leaf-blades entire or repand. 



Corolla-limb deeply 5-parted, the 

 lanceolate, acute. 

 Corolla golden-yellow. Mexican. 

 Corolla scarlet. West Indian. 

 Corolla with 5 short, triangular, scarcely 

 spreading, acute lobes. 

 Leaf-blades lobed or 3-9-di>ided. 



Stems creeping ; blades very small. 



Corolla scarlet, constricted above. 

 Corolla white, funnelform above. 

 Stems twining or trailing. 



Corolla white ; leaf-blades sinuately 



lobed. 

 Corolla scarlet ; blades divided. 



Sepals equal ; leaf-segments obtuse. 

 Leaf-segments linear ; corolla 



scarlet. 

 Leaf-segments obovate ; 

 corolla greenish ; stems mi- 

 nutely pilose. 

 Sepals unequal. 



Leaf-segments oblong-lance- 

 olate, acuminate. 

 Leaf-segments narrowly lance- 

 olate, obtuse; corolla-tube 

 slightly inflated. 



lobed 



lobes 



1. E. racemosum. 



2. E. Wrighlii. 



3. E. Rtidophii. 



4. E. velutifoliuin. 



5. E. bracteattim. 



6. E. jalapoides. 



7. E. fuchsioicies. 



8. E. argentifoliuvi. 



9. E. Conzattii. 



10. E. microJactylum. 



11. E. liiteiivi. 



12. E. repaiidutn. 



13. E. filiforme. 



14. E. arenarium. 



15. E. Eggersii. 



16. E. cubense. 



17. E. eriospermum. 



18. E. viridijlortim. 



19. E. leuconeurum. 



20. E. pedatum. 



