KEY TO THE FAMILIES OF FLOWERING PLANTS 

 DESCRIBED IN THIS FLORA 



CLASS I 



GYMNOSPERMS. Ovules not inclosed in an ovary. 



Trees or shrubs. Leaves usually evergreen and needle-shaped, awl-shaped, 

 or scale-like. Flowers monoecious or dioecious. Fruit a scaly cone, o'r " 

 sometimes appearing berry-like. l v Pine Family, page 13 



CLASS II 



ANGIOSPERMS. Ovules inclosed in an ovary. 



SUBCLASS I. MONOCOTYLEDONS. Flowers usually with their 

 parts in threes, never in fives. Leaves usually parallel-veined. Cotyledon 1. 



(1) Flowers inclosed by chaffy bracts. FAMILY PAGE 



Flowers 2-bracted. Leaves 2-ranked. Stem cylin- 

 drical 4. Grass .... 22 



Flowers 1-bracted. Leaves 3-ranked. Stem trian- 

 gmlar 5. Sedge .... 23 



(2) Flowers on a spadix. 



Spadix slender, hairy, and bristly 2. Cat-Tail ... 20 



Spadix fleshy 6. Arum .... 24 



(3) Flowers not on a spadix. 



(a) Carpels usually numerous and nearly or entirely 



separate 3. Water Plantain . 21 



(6) Carpels united. 



* Perianth hypogynous or nearly so. 



t Perianth actinomorphic, its parts similar, green, 



or chaffy 9. Rush .... 30 



1 1 Perianth of 2 sets, one sepal-like, the other petal- 

 like. 



Style and stigma 1. Petals 3 or 2, soon disap- 

 pearing 7. Spiderwort . . 26 



5 



