OUTLINE OF TWENTY LESSONS. 297 



I. Flowers hypogynous. 



Urticiflor^ : Flowers not in true aments. 



UrticacecB ; nettle family. 



UlmacecB ; elm family. 

 PolvgonifloRjE : Fruit a triangular or lenticular achene. 



PolygonacecB ; knotweed family, knotvveed, buckwheat. 

 CuRVEMBRY^ : Embryo curved in the seed. 



PorlulacacecB , pursley family, claytonia (spring beauty). 



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



ChenopodiacecB ; pigweed family, pigweed, beet, Russian 

 thistle, etc. 

 POLYCARPiC^ : Carpels usually numerous and always distinct. 



Ranunculacece ; buttercup family (crowfoot family), butter- 

 cups, marsh -marigold, clematis, etc. 



Nympheacece ; water-lily family. 



Berberidacea ; barberry family, mandrake, etc. 

 Rhceadin/E : The flowers are dimerous or tetramerous. 



Papaveracece ; poppy family, bloodroot, etc. 



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

 breeches. 



Crucifei'iF ; mustard family, toothwort, cabbage, turnip, etc. 



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

 Violacea ; violet family. 



Sarraceniacem ; pitcher-plant family. 

 Gruinales : Carpels united, styles prolonged into a beak. 



Oxalidacece ; oxalis family. 



Linacem ; flax family. 



Geraniacece ; geranium family, cranesbill, etc. 

 ColumnifeRjE : Stamens usually united by their filaments into 

 a column. 



Malvacece ; mallow family, hollyhock, cotton, etc. 



2. Flowers perigynous or epigynous. 



^SCULiN^ : Stamens arising from a glandular disk, trees or 

 shrubs. 



