KEY TO THE FAMILIES 



Class I. GYMNOSPERMS 



Ovules naked upon a scale or bract (not inclosed in an ovary). 

 Besinous trees or shrubs with evergreen leaves .... Plnacese B 



Class II. ANGIOSPERMS 

 Ovules inclosed in an ovary. 



Sub-class (I) MONOCOTYLEDONS 



Parts of the flower usually in threes (never in fives) ; leaves mostly parallel- 

 veined ; ours all herbs. 



1. Flowers usually with neither calyx nor corolla and massed upon a 

 more or less fleshy axis (spadix) 



Marsh or aquatic plants, with linear leaves. 



Flowers in a dense cylindrical terminal spike .... Typhacese 7 

 Flowers in globular heads . Sparganlacese 7 



3. Flowers ivith calyx and corolla alike (perianth) or different, not 

 collected upon a spadix 



a. Ovary superior (appearing within the flower) 



Pistils numerous AlismacesB 7 



Pistil one. 



Perianth of similar divisions or lobes. 



Styles 3 ; fruit a capsule . Melanthacese 8 



Style 1 ; fruit a capsule I,iliaceae 9 



Style 1 ; fruit a berry .... . Convallariaceae 11 



Perianth of 3 green sepals and 3 colored petals . . Commelinaceae 8 



b. Ovary inferior (appearing below the flower) 



Stamens 3 ... . . Iridaceae 12 



Stamens 1 or 2 and massed with the style ; flowers irregular Orchldaceae 12 



Sub-class (II) DICOTYLEDONS 



Parts of the flower usually in fives or fours ; leaves mostly net-veined. 



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