

House: North American Convolvulaceae 105 



glabrous, 5-6 mm. long, rounded: corolla white, funnelform, 

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

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

 exceeding the calyx ; seeds lanate on the dorsal angles. (Plate 

 2, figure a.) 



"St. Thomas: Eggers, Feb. 1887 (type in herb. N. Y. Bot. 



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

 Gray). 



- 



1 6. 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 mm - 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 

 mto 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 495 

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



This might be the Ipomoea altemiflora 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. cubense. All material of Wright's, 

 other than this, labeled /. altemiflora, is Ipomoea obtusata Griseb. 

 a "d it is evident that either the corolla was wrongly described in 

 I altemiflora, or what is more likely, considering the mixture of 

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



T j 



J - altemiflora represents two species, viz. E. cubense in part and 

 Ipomoea obtusata as to the flowers. 



l 7- Exogonium eriospermum (Desr.) Choisy, Conv. Rar. 130. 



183;.— In DC. Prodr. 9: 347- l8 45 



> 



uus eriosp 



eriosperma Raf. Fl. Tellur. 4 



3: 567. 1789. 

 1838. — Urb.Symb. 



3:350. 1902. Not /. eriosperma Beau v. 1807. 

 Ipomoea Desrousseauxii Steud. Norn. ed. 2. 816. 1841. 





