OUTLINE OF TWENTY LESSONS. 297 



I. Flowers hypogynous. 



Urticiflorje : Flowers not in true aments. 

 Urticacece ; nettle family. 

 Ulmacem ; elm family. 

 Polygoniflorte : Fruit a triangular or lenticular achene. 



PolygonacecB ; knotweed family, knotvveed, buckwheat. 

 Curvembry^e : Embryo curved in the seed. 



PoriulacacecE ; pursley family, clay tonia (spring beauty). 



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



Chenopodiacece ; pigweed family, pigweed, beet, Russian 

 thistle, etc. 

 Polycarpicle : Carpels usually numerous and always distinct. 



RanunculacecB ; buttercup family (crowfoot family), butter- 

 cups, marsh-marigold, clematis, etc. 



Nympheacece ; water-lily family. 



Berberidaceee ; barberry family, mandrake, etc. 

 Rhceadin^e : The flowers are dimerous or tetramerous. 



Papaveracetz ; poppy family, bloodroot, etc. 



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

 breeches. 



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



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



Violacetz ; violet family. 



Sarraceniacetz ; pitcher-plant'family. 

 Gruinales : Carpels united, styles prolonged into a beak. 



Oxalidacece ; oxalis family. 



Linacece ; flax family. 



Geraniacece ; geranium family, cranesbill, etc. 

 ColumnifeRj« : Stamens usually united by their filaments into 

 a column. 



Malvacece ; mallow family, hollyhock, cotton, etc. 



2. Flowers perigynous or epigynous. 



./Esculiisue : Stamens arising from a glandular disk, trees or 

 shrubs, 



