House: Nortfi American Convolvulaceae 105 



glabrous, 5-6 mm. li)ng, rounded : corolla white, funnclform, 

 expanding from the base upward, 3.5-4 cm. long, the limb 3-3.5 

 cm. broad with 5 slightly rounded lobes : capsules ovoid, exceed- 

 ing the calyx ; seeds lanate on the dorsal angles. (Plate 2, 

 FIGURE a.) 



St. Thomas : Eggers, Feb., i<S87 (type in herb. N. Y. Hot. 

 Garden), January 14 and March 24, 1876; 266, 1880 (in herb. 

 Gray). 



16. Exogonium cubense sp. nov. 



A slender, perennial, twining vine, several m. high : stems 

 woody below : leaf-blades ovate, or ovate-lanceolate, 3-8 cm. long, 

 obtuse or subcordate at the base, entire or sinuately 3-5-lobed, 

 middle lobe largest, lateral ones oblique and half as long ; petioles 

 shorter than the blades : peduncles 2-5 cm. long, 2-5-flowered ; 

 pedicels 10-15 "^'^i- long: sepals unequal, the inner larger, ovate, 

 obtuse, 8-10 mm. long and nearly as broad, the outer 5-6 mm, 

 long: corolla white, about 5 cm. long, the tube 2-2.5 cm. long, 

 thicker within the calyx than above, where it begins to expand 

 into a funnelform or subsalverform limb 4-5 cm. broad and 5- 

 lobed, the externally green plaits of the corolla ending in minute 

 cusps at the margin. (Plate 2, figure b.) 



Cuba : Gorge of the Yumuri, Matanzas, Britton & Shafer ^p^, 

 March 20, 1903 (type in herb, N. Y. Bot. Garden). 



This might be the Ipovioea altcniiflora Griseb. as to all parts 

 except the corolla, which is described as being purple, and an 

 unnumbered specimen of Wright's so labeled in the Gray Her- 

 barium is identical with E. aibense. All material of Wright's, 

 other than this, labeled /. altcriiiflora, is Ipomoea obtiisata Griseb. 

 and it is evident that either the corolla was wrongly described in 

 /. alterniflora, or what is more likely, considering the mixture of 

 species under some of Wright's numbers, that the description of 

 /. alterniflora represents two species, viz. E. cubcns in part and 

 Iponioca obtJisata as to the flowers. 



17. Exogonium eriospermum (Desr.) Choisy, Conv. Rar. 130. 

 1837. — In DC. Prodr. 9: 347. 1845 



Convoknihis criospermiis Desr. in Lam. Kncyc. 3: 567. 1789. 

 Ipomoea eriospcnna Raf. P^l. Tellur. 4 : 74. 1838. — Urb. Symb. 



■^"t:. 3: 350. 1902. Not /. eriosperiiia Beauv. 1807. 

 Ipomoea Dcsrousseaiixii Stcud. Nom. ed. 2. 816. 1841. 



