102 House: North American Convolvulaceae 



8. Exogonium argentifolium (A. Rich.) 



Ipomoea? argentifolia A. Rich, in Sagra, Hist. Fis. Cuba II : 13 1. 

 1850. 



Ipomoea praecox Wright [in Sauv. Fl. Cub. 107] Anal. Acad. 

 Habana 7 : 46. 1870. 



A stout twining vine : stems tomentose above : leaf-blades 

 oblong-lanceolate to elliptical-oblong, acute or rounded at the 

 base, the apex acute or obtuse, 2-10 cm. long, woolly above, 

 becoming glabrate : sepals suborbicular, obtuse, 5-6 mm. long, 

 woolly or tomentose without, equal : corolla salverform, the tube 

 6-7 mm. in diameter ; the limb 3 cm. broad. 



Type locality : " Prope Nouvelle Sophie," Isle of Pines. 



Distribution : 



Mexico 



Specimens examined: Cuba, C. Wright 449, 364.6 ; Cook, 

 1905. Isle of Pines, Curtiss 489, 1904, Rowlee 182, 1901 

 Mexico : Oaxaca, Conzatti & 

 1894: Puebla, E. W. Nelson 2009, l8 95. Pringle 7016, 1895. 



9. Exogonium Conzattii (Greenm.) 



Ipomoea Conzattii Greenm. Field. Col. Mus. Publ. Bot. 2 : 258. 

 1907. 



Resembling the preceding : leaf-blades not seen : flowers in 



n A r% -k .-. *■-% . - Q ^ - ^ _1 1 • 1 1 ... - m 1 . _1 ~n 



dense 

 tomentose 



— _...^„ 1J& mv p^cunig . icai-uiaaes not seen : novvcio «• 

 , many-flowered, subsessile clusters ; pedicels and peduncles 

 ltose : sepals slightly unequal, broadly ovate, obtuse, tinged 

 with red : corolla-tube 3 cm. long, the scarlet limb 2 cm. broad, 

 pubescent without: capsules 10-12 mm. in diameter, 2-celled ; 

 coma of hairs on the seeds white. 



Type locality : Almoloyas, Guerrero, Mexico. 

 Distribution : Southern Mexico. 



Specimens examined: Guerrero, E. W. Nelson 2095, 1^94 

 (in herb. Gray and Nat. Herb.). (The type, Conzatti 1666, 19 06 ' 



ip 



10. 



microdactyl 



A 



1866. 



glabrous twining vine : stems woody below, striated or 



muricate : leaf-blades 3 



3-6 



textured, lobes usually oblanceolate, obtuse, reticulate-veined: 

 peduncles 1 -3 -flowered : sepals unequal, orbicular-ovate, obtuse, 

 5-7 mm. long : corolla scarlet, subsalverform, 3-4 cm. long, the 

 limb 3-5 cm. broad and slightly 5-lobed : capsules 10 mm. in 

 diameter, ovoid, apiculate. 



