LXXXVIII. CONTOLTULACE.i:. 223 



Ciiscuta). — DrsTEiB. Throughout the world, more abuudant in the 

 wanner regious ; genera 42 ; species about 800. 



Corolla-tube usually uniformly enlarged from base to apex, the 

 6 bands rarely clearly deflned from the intervening spaces ; 

 pollen not echinulate. 



Yellow parasitic leafless twining herbs 1. Cuscut.v. 



Green non-parasitic leafy herbs or shrubs. 



Fruit indehiscent ; style 2, Euycibe. 



Fruit dehiscent, or, if indehiscent, small, with thin 

 fragile walls ; style or styles present. 



Sepals much enlarged in fruit; capsule l-seeded, 



indehiscent or rarely 2-valved 3. Pouana. 



Sepals not or slightly enlarged in fruit ; capsule 

 valvate or opercular, rarely dehiscing ir- 

 regularly. 



Styles 2, free or partly united below. 



Capsule sessile in the middle of a large 



flat bract 4. NEuuorELTis. 



Capsule not sessile in the middle of a 

 large bract. 



Corolla-lobes imbricate ; flowers axil- 

 lary, solitary ; styles 2, quite free ; 



stamens exserted 5. Cress A. 



Corolla-lobes induplicate-contorted ; 

 flowers cymose ; stamens not ex- 

 serted. 



Capsule 4-valved ; styles free, 

 each 2-branched ; stigmas on 



inner face of style-arms 6. Evolvulus. 



Capsule irregularly dehiscent ; 

 styles usually partly united 

 below, not branched above ; 



stigmas 2, capitate 7. Breweria. 



Styles entire ; stigmas usually 2. 



Ovary 1 -celled ; capsule 4-valved, 8- 



seeded ; stigmas short, oblong 8. Hewittia, 



Ovary 2 (sometimes 4) -celled. 



Outer sepals larger than the inner 

 and decurrent on the pedicel ; 



stigmas capitate 9. Aniseia. 



Outer sepals not larger than the 

 inner, not decurrent on the 

 pedicel. 



Stigmas elongate. 



Stems erect or prostrate, 

 rarely twining ; stigmas 

 oblong or linear ; cap- 

 sule 4-valved 10. Convolvulus. 



Stems twining, rarely pros- 

 trate; stigmas elliptic; 

 capsule usually 8- valved. 11. JacquExMOntia. 

 Stigmas globose. 



Capsule 4-valved ; stems not 



winged 12. Merremia. 



Capsule operculately dehi- 

 scent ; stems winged 13. Operculina. 



Corolla-tube not uniformly enlarged from base to apex, the 

 5 bands on the lobes clearly defined by 2 prominent lines ; 

 pollen echinulate. 



Fruit dehiscent, or, if indehiscent, then with thin fragile 

 walls. 



Corolla more or less campanulate ; sepals never 



aristate ; stamens not exserted 14. Ipo.mcea. 



