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. 



3. E. Rudolphii. 



4. E. velutifoiium 



5. £. bracteatum. 



6. E. jalapoides. 



7. E. fuchsioides. 



8. E. argentifolium 



9. E. Conzattii. 



10. E. microdactylum 



Key to tlie species 



A. Inflorescence wilh conspicuous bracts. 



Bracts ovate-elliptical to linear-lanceolate. 

 Inflorescence long-peduncled. 

 Bracts 2-3 cm. long. 



Bracts elliptical-obovate, obtuse ; sepals 



obtuse. I. E. racemosum 



Bracts linear-lanceolate; sepals acuminate. ^2. E. WrightiL 

 Bracts I cm. 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 3 -lobed 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, lobed 

 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-dkided. 



Stems creeping; blades very small. 

 Corolla scarlet, constricted above. 

 Corolla white, funnelform above. 

 Stems twining or trailing. 



Corolla white; leaf-blades sinuately 

 lobed. J 



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 



lobes 



11. £. luleum. 



12. E. repandum. 



13. £. filiforme. 



14. E. arenariutn. 



15. E. Eggersiu 



16. E. cubense. 



17. E* eriospermunu 



18. E. viridiflorum 



19. E. feuconeurum. 



slightly inflated. 



20. E. pedatutn 



