CONVOLYULACEAE. 151 



Styles distinct, each 2-cleft : stigmas 4. 2. Evolvulcs. 



Styles milted up to the stigma. 

 Fruit capsular, dehiscent. 



Stigmas ovoid or subglobose. 



Caly.x urceolate: stamens spirally twisted. 3. Operculixa. 



Calyx campanulate : stamens straight. 



Stamens and style included : corolla funnelform. 

 Calyx herbaceous ; lobes elongate, usually pi- 

 lose : ovary usually ."J-ceiled. 4. Piiarbitis. 

 Calyx leathery or membranous ; lobes short : 



ovary 2- or 4-ceiled. 5. Ipomoea. 



Stamens and style exserted : corolla usually salver- 

 form. 

 Corolla large, showy, 10-20 cm. long, white. 6. Caloxyction. 



Corolla smaller, 5-6 cm. long or less, rarely white. 



Seeds glabrous : herbaceous vines. 7. Quajioclit. 



Seeds pubescent : partially woody vines. 8. Exogoniuxe. 



Stigmas flattened. 9. .Tacquemontia. 



Fruit baccate, indehiscent. 10. Ahgyreia. 



1. STYLISMA Raf. Herbaceous vines, often prostrate. Leaf -blades 

 narrow or broad, not cordate. Flowers 1-3 on axillary peduncles. Sepals 

 equal or nearly so, pointed. Corolla white or colored, rotate or subfunnelform. 

 Capsule thin-walled. 



1. S. aquatica (Walt.) Chapm. Stems trailing, softly pubescent: leaf-blades 

 2.5-3 cm. long, obtuse: peduncles longer than the leaves, 1-3-flowered: sepals 

 oblong-lanceolate, acute, 4-6 cm. long: corolla rose-purple, 10-1.5 mm. long: 

 capsules G-S mm. in diameter. — Pinelands. 



2. EVOLVULUS L. Erect or diffuse herbs or partially wooily plants. 

 Leaf-blades entire. Flowers solitary and axillary or in terminal racemes or 

 panicles. Calyx small: lobes nearly equal. Corolla white, pink, or blue, rotate 

 or rotate-f unnelform : limb 5-angled or 5-lobed. Capsule subglobose, 2-4- 

 valved. 



1. E. sericeus Sw. Plants silky, the branches ascending or decumbent, 1-3 

 dm. long: leaf-blades linear to oblong, 1-2.5 cm. long, acute at both ends: 

 calyx-lobes 4-6 mm. long, acute or acuminate: corolla white or blue, 8-10 

 mm. wide. — Everglades. — (Bah., Cuba, Ant.) 



3. OPERCULINA S. Manso. Twining vines. Leaf-blades entire, pal- 

 mately lobed, or divided. Calyx large, pear-shaped, constricted above in 

 flower: lobes closely imbricate, membranaceous or chartaceous. Corolla cam- 

 panulate. Capsule globose, large, often operculate or irregularly dehiscent, 

 sometimes valvate. 



Corolla yellow : sepals becoming 4-.5 cm. long. 1. 0. tuhrrosa. 



Corolla white, except the purple throat : sepals becoming 1.5-2 cm. 



long. 2. O. dissccta. 



1. O. tuberosa (L.) Meisn. Leaf-V)lades 5-7-lobed; lobes elliptic-lanceolate, 

 acuminate, 4-6 cm. long: corolla 3.5-4 cm. long; limb 5-6 cm. wide: capsules 

 3-4 cm. in diameter: seeds 20x15 mm., black-velvety. — Pinelands, hammocks 

 and waste places. Nat. of the Tropics, and cultivated. — {Cuba, Ant.) — 

 Yellow morning-glory. 



2. O. dissecta (.Jacq.) House. Leaf -blades 5-7-parted; segments oval to 

 oblong or lanceolate, 3-10 cm. long, coarsely toothed: corolla 2-3 cm. long; 

 limb 3-5 cm. broad: capsules about 1.5 cm. in diameter: seeds glabrous. 

 [Ipomoea dissccta Jacq.] — Pinelands. — (Ber., Bah., Cuba, Ant.) 



4. PHARBITIS Choisy. Climbing or trailing vines. Leaf-blades entire, 

 lobed, or angled. Calyx-lobes equal or unequal, herbaceous, each with a pubes- 



