16 CLASS 111. ORDER III. 



62. Elymus. Involucre four leaved, two flowered ; 

 flowers compound. 



53. HoRDEUM. Involucre six leaved, three flow- 

 ered; flowers simple. 



Order III. TRIGYNIA. TJiree styles. 



A. Flowers inferior. 



54. Lechea. Corolla three petalled; calyx three 

 leaved ; capsule three celled, three valved. 



55. MoLLUGO. Corolla none; calyx five leaved; 

 capsule three celled. 



B. Floivers superior. 



5G. Proserpinaca. Corolla none ; calyx three part- 

 ed ; seed one, three celled. 



TRIANDRIA. 



MONOGYNIA. 



18. IRIS. 

 Iris versicolor. L. Blue Flag. 



American Medical Botany, PI. xvi. 



Leaves ensiform, stem acute on one side, capsules 

 oblong, three sided, with obtuse angles. 

 iS^?2. Iris Virginica. 1st edit. 



The most common and showy ornament of our meadows in 

 the early part of summer. The root is fleshy, horizontal, send- 

 ing down a multitude of fibres. Stem two or three feet high, 

 round on one side, acute on the other, frequently branched, and 

 bearing from two to six flowers. Leaves sword shaped, striated, 

 sheathing at base. Bractes becoming scarious. Peduncles of 

 various length, flattened on the inside. Germ three cornered, 

 with fiat sides and obtuse angles. Outer petals of the flower 

 spatulate, b'&ardless, the border purple, the claw variegated with 



