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, or 

 sometimes appearing berry-like. 1. 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. Grsiss . . . 22 



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

 gular . 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 neai-ly or entirely 



separate .3. Water Plantain . 21 



(6) Carpels united. 



* Perianth hypogynous or nearly so. 



t Perianth actinomorphic, its parts similar, green, 



or chatfy . . 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 



