COSVOLVULACEM. 9 



Flowers in racemes or panicles, outer 

 3 or all the sepals enlarged in fruit ; 

 capsule 1-seeded, indehiscent, rarely 

 2-valved 3. PORANA. 



Flowers in cymes or solitary ; capsule 

 yalvate or opercular, rarely dehiscing 

 irregularly. 



Styles 2, distinct from the base, sepals 

 not or slightly enlarged in fruit. 



Corolla-lobes imbricate, flowers 

 solitary in the upper axils, 

 stamens exserted . . .4. CRESSA. 



Corolla-lobes in duplicate-contorted, 

 flowers in few-flowered peduncled 

 cymes or solitary in the axils, 

 stamens included or slightly 

 exserted 5. EVOLVULUS. 



Style entire, stigmas usually 2. 



Ovary 1-celled, capsule 4-valved ; 

 stigmas short, oblong, calyx-lobes 

 not enlarged ; bracts 2, large, 

 enclosing the calyx . . .6. CALTSTEGIA. 



Ovary 2- or sometimes 4-eelled. 

 Stigmas elongate. 



Stigmas filiform, ovary 2-celled, 

 capsule 4-valved or indehi- 

 scent, hairs tdmple or rarely 

 2-branched . . . .7. CONVOLVULUS. 



Stigmas elliptic, ovary 2-celied, 

 capsule usually 8-valved, 

 hairs 3-mar.y-branched . 8. JACQUEMONTIA* 



Stigmas globose. 



Capsule 4-valved, stems not 



winged . . . .9. MERREMIA. 



Capsule circumscissile above 



the middle, stems winged . 10. OPERCULINA. 



Corolla-tube not uniformly enlarged from the 

 base, the five bands on the lobes clearly 

 defined by 2 prominent lines, pollen echinu- 

 late. 



Fruit dehiscent, or if indehiscent then with 

 thin fragile walls. 



