OUTLINE OF TWENTY LESSONS. 



i. Flowers hypogynous. 



URTICIFLOR^ : Flowers not in true aments. 



Urticacecz ; nettle family. 



Ulmacece ; elm family. 

 POLYGONIFLOR^E : Fruit a triangular or lenticular achene. 



Polygonacece ; knotweed family, knotweed, buckwheat. 

 CURVEMBRY^E : Embryo curved in the seed. 



Porlulacacece ; pursley family, claytonia (spring beauty). 



Caryophyllacece ; pink family, carnation, corn-cockle, etc. 



Chenopodiacea ; pigweed family, pigweed, beet, Russian 



thistle, etc. 

 POLYCARPIC^E : Carpels usually numerous and always distinct. 



Ranunculacece ; buttercup family (crowfoot family), butter- 

 cups, marsh-marigold, clematis, etc. 



Nympheacea ; water-lily family. 



Berberidacea ; barberry family, mandrake, etc. 

 RHCEADIN^E : The flowers are dimerous or tetramerous. 



Papaveracecz ; poppy family, bloodroot, etc. 



Fumariacea ; fumitory family, squirrel-corn, dutchman's- 

 breeches. 



Cruciferce ; mustard family, toothwort, cabbage, turnip, etc. 



Droseracece ; sundew family, sundew, venus-flytrap, etc. 



Violacece ; violet family. 



Sarraceniacece ; pitcher-plant family. 

 GRUINALES : Carpels united, styles prolonged into a beak. 



Oxalidacece ; oxalis family. 



Linacecz ; flax family. 



Geraniacece ; geranium family, cranesbill, etc. 

 COLUMNIFER^E : Stamens usually united by their filaments into 

 a column. 



Malvacece ; mallow family, hollyhock, cotton, etc. 



2. Flowers perigynous or epigynous. 



Stamens arising from a glandular disk, trees or 

 shrubs, 



