354 CONVOLVULACEAE. 



10. Ipomoea tiliacea (Willd.) Choisy, in DC. Prodr. 9: 375. 1845. 



Convolvulus tiliaceus Willd. Enum. 1: 203. 1809. 

 Convolvulus fastigiatus Eoxb. Hort. Beng. 13. 1814. 

 Ipomoea cymosa G. F. W. Meyer, Prim. PI. Esseq. 99. 1818. 

 Ipomoea fastigiata Sweet, Hort. Brit. 288. 1826. 



Ipomoea gracilis House, Ann. N. Y. Acad. Sei. 18 : 248. 1908. Not E. Br. 

 1810. 



Glabrous or sparingly pubescent, twining, up to 2 m. long or longer, the 

 root sometimes tuberiferous. Leaves ovate, 5-8 cm. long, membranous, acute 

 at the apex, cordate at the base, the slender petioles sometimes half as long 

 as the blades ; peduncles as long as the petioles or longer ; cymes few-several- 

 flowered; pedicels short; sepals oblong, mucronate or aristulate, about 8 mm. 

 long; corolla purple, pink or rarely white, usually with a dark eye, funnelform- 

 campannlate, 5-6 cm. long; capsule 2-celled, subglobose, 8-10 mm. in diameter; 

 seeds glabrous. 



Swampy scrub-lands, Great Bahama and Andros : Florida ; the West Indies ; 

 continental tropical America. DARK-EYED MORNING-GLORY. 



11. Ipomoea Batatas (L.) Lam. Encycl. 6: 14. 1804. 



Convolvulus Batatas L. Sp. PI. 154. 1753. 



.Eootstocks large, fleshy, a well-known vegetable. Stems glabrous or 

 nearly so, trailing, 1 m. long or longer. Leaves various, ovate to suborbicular, 

 entire, dentate or lobed, acuminate at the apex, cordate at the base, 5-15 cm. 

 long; peduncles as long as the petioles or shorter, few-flowered; sepals oblong, 

 acute, cuspidate, somewhat unequal, 7-10 mm. long; corolla pale purple or 

 nearly white, about 5 em. long; ovary and capsule 2-celled; seeds glabrous. 



Thickets and cultivated soils, spontaneous after cultivation, Abaco, Andros, 

 New Providence and Eleuthera : spontaneous after cultivation, Florida to Arkansas 

 and Texas ; West Indies ; continental tropical America, and Old W T orld tropics. 

 Native habitat unknown. Catesby, 2 : pi. 60. SWEET POTATO. 



7. TUHBINA Eaf. M. Tell. 4: 81. 1838. 



Vines with cordate leaves, and axillary peduncled clusters of large or 

 middle-sized flowers. Sepals ovate to lanceolate. Corolla campanulate or 

 funnelform. Ovary 2-celled or 4-celled ; stigmas 2. Fruit dry, woody, inde- 

 hiscent, subglobose or ovoid, 1-celled, mostly 1-seeded', the seeds smooth. 

 [Latin, from the supposed top-shaped fruit.] About 20 species, natives of 

 tropical regions, the following typical. 



1. Turlnna corymbosa (L.) Eaf. Fl. Tell. 4: 81. 1838. 



Convolvulus corymTjosus L. Syst. ed. 10, 923. 1759. 

 Convolvulus domingensis Desv. in Lam. Encycl. 3: 554. 1791. 

 Convolvulus sidaefolius H.B.K. Nov. Gen. 3: 99. 1818. 

 Ipomoea sidaefolia Choisy, Mem. Soc. Phys. Gen6ve, 6: 459. 1833. 

 Ipomoea antillana Millsp. Field Mus. Bot. 2: 84. 1900. 



High-climbing or trailing, glabrous. Leaves slender-petioled, ovate, entire, 

 4-10 cm. long, acute or acuminate at the apex, cordate at the base; peduncles 

 axillary, as long as the leaves or longer, corymbosely or paniculately several- 

 many-flowered, the pedicels slender ; sepals oblong, persistent, the 3 inner ones 

 8-12 mm. long, nearly twice as long as the two outer ; corolla white, 2.5-3 cm. 

 long; capsule ovoid, acute, about half as long as the longer sepals, 1-seeded. 



Coppices, walls and thickets, Andros, New Providence, Cat Island, Watling's 

 Island : Florida ; Bermuda : Cuba to Guadeloupe : Barbadoes ; Jamaica ; Mexico to 

 northern South America. Recorded by Mrs. Northrop as Ipomoea fastigiata Sweet. 

 CHRISTMAS-VINE. CHRISTMAS-FLOWER. 



