CONVOLVULACEAE. 151 



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



Styles united up to the stigma. 

 Fruit capsular, dehiscent. 



Stigmas ovoid or subglobose. 



Calyx urceolate : stamens spirally twisted. 3. OPEBCULINA. 



Calyx campanulate : stamens straight. 



Stamens and style included : corolla funnelform. 

 Calyx herbaceous ; lobes elongate, usually pi- 

 lose : ovary usually 3-celled. 4. PHARBITIS. 

 Calyx leathery or membranous ; lobes short : 



ovary 2- or 4-celled. 5. IPOMOEA. 



Stamens and style exserted : corolla usually salver- 

 form. 



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



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



Seeds glabrous : herbaceous vines. 7. QUAMOCLIT. 



Seeds pubescent : partially woody vines. 8. EXOGOXIUM. 



Stigmas flattened. 9. JACQDEMONTIA. 



Fruit baccate, indehiscent. 10. ABOYEEIA. 



1. STYLISMA Eaf. 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, 10-15 mm. long: 

 capsules 6-8 mm. in diameter. Pinelands. 



2. EVOLVTJLUS L. Erect or diffuse herbs or partially woody 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 unnelf orm : 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. OPEKCULINA 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. tuberosa. 



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



long. 2. O. dissecta. 



1. O. tuberosa (L.) Meisn. Leaf-blades 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 dissecta Jacq.] Pinelands. (Ber., Bah., Cuba, Ant.) 



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

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



