KEY TO THE ORDERS. 



Ovules and seeds borne on the surface of a scale or bract; stigmas 

 wanting. Phylum STROBILOPHYTA. 



Ovules and seeds borne in a closed cavity, the ovary; stigmas present. 



Phylum ANTHOPHYTA. 



Phylum STROBILOPHYTA. 

 Only one order represented in the state. CONIFERALES: 5. 



Phylum ANTHOPHYTA. 



Seeds with one cotyledon; fibrovascular bundles of the stem scat- 

 tered; parts of the flowers usually in 3's or 6's; leaves mostly parallel 

 veined. Class. 1. MONOCOTYLEDONEAE. 



Seeds with two cotyledons; fibrovascular bundles of the stem forming 

 a ring around a central core of pith; parts of the flowers rarely in 

 3's or 6's; leaves mostly net-veined. Class. 2. DICOTYLEDONEAE. 



Class 1. MONOCOTYLEDONEAE. 



Overy superior. 



Perianth of two series, the inner usually corolloid. 



Carpels distinct. ALISMALES: 6. 



Carpels united; i. e. ovary compound. LILIALES: 9. 



Perianth reduced to scales or bristles, or wanting, never corolloid. 

 Flowers not in the axils of dry, chaffy bracts. 

 Plants with normal stems and leaves. 

 Aquatics, wholly submerged or the upper leaves floating. 

 Carpels separate. LILIALES: 9. 



Carpels united. ALISMALES: 6. 



Terrestrial plants or if aquatics not submerged. ARALES: 15. 

 Plants with stems reduced to leaf-like structures, called thalli; 

 leaves wanting. ARALES: 15. 



Flowers in the axils of dry or chaffy bracts. POALES: 17. 



Ovary inferior. 



Aquatic plants with submerged fruits. HYDRALES: 48. 



Terrestrial plants, or if aquatic fruits not submerged. 



Flowers regular. IRIDALES: 48. 



Flowers irregular. ORCHIDALES: 49. 



Class 2. DICOTYLEDONEAE. 



Ovary superior. 

 A. Corolla present. 

 Petals distinct. 

 Carpels solitary, or several and distinct, or united only at the 

 base. 

 Stamens borne at the base of the receptacle. 



Herbs of moist places or xerophytic shrubs. RANALES: 51. 

 Xerophytic herbs with succulent leaves. Sedum: 142. 



