CLASS IV. ORDER I. 51 



Class IV. TETRANDRIA. Four stamens. 

 Order I. 3IONOGYNIA. One style. 



57. Cephalanthus. Proper calyx superior, funnel 

 form ; common receptacle globular ; seed one, downy. 



58. Plantago. Calyx four cleft ; corolla four cleft, 

 inferior, with a reflected border ; stamens very long ; 

 capsule two celled, opening transversely. 



59. Centaurella. Calyx four parted ; corolla four 

 parted, somewhat bell shaped ; capsule invested with 

 the permanent corolla and calyx, one celled, two 

 valved. 



60. Mitchella. Corolla rnonopetalous, superior, 

 two on each germ ; stigmas four ; berry bifid, four 

 seeded. 



61. HousTONiA. Corolla rnonopetalous; calyx four 

 toothed ; capsule two celled, two valved. 



62. Ammannia. Calyx inferior, tubular, eight tooth- 

 ed ; capsule four celled. 



63. Galium. Corolla flat, superior ; seeds two. 



64. CoRNus. Calyx four toothed ; corolla four pe- 

 talled, superior ; drupe with a two celled nut. 



65. IcTODEs. Spathe one leaved ; spadix oval, 

 covered with flowers ; calyx wedge shaped ; seeds 

 numerous, globular, imbedded in the spadix. 



66. LuDwiGiA. Calyx four parted, superior ; petals 

 four ; capsule quadrangular, four celled. 



67. IsNARDiA. Calyx campanulate, four cleft, per^ 

 manent ; corolla none; capsule four celled. 



68. SwERTiA. Calyx flat, four or five parted; co- 

 rolla four parted, segments spreading with two nec- 

 tariferous, ciliate pores at the base of each. 



