APOCYXACEAE 107 



Leaves smooth margined, calyx lobes ovate, some or all shorter than 



the tube, smooth. 



Flowers white tinged with yellow and green, calyx lobes equal, 



corolla lobes twice as long as the appendages. 3. G. flavida.' 



Flowers blue or white, calyx lobes unequal, corolla lobes about 



three times as long as the appendages. 4. G. rubicaulis. 



1. Gentiana puberula Michx. 



On prairies, most common in the eastern part of the state. Crete; 

 Lincoln; Simeon; Utica; Valentine; Weeping Water; Wood Lake. 



2. Gentiana andrewsii Griseb. 



In low meadows mostly in the sand-hill regions. Ainsworth; Kearney; 

 Xeligh; Newark; Plain view; Thedford; Valentine. 



3. Gentiana flavida A. Gray. 



Rare along the lower Missouri. Nemaha County. 



4. Gentiana rubicaulis Schwein. 



Prairies in the eastern part of the state. Nehawka. 



3. Menyanthes. 726. 



1. Menyanthes trifoliate L. 



In marshes, not common. Kennedy; Simeon. 



3. APOCYNACEAE. 



Apocynum. 738. 



Calyx less than half as long as the corolla-tube, flowers over 5 mm, 

 long. 1. A. androsaemifolium 



Calyx about as long as the corolla-tube, flowers less than .5 mm. long. 

 Leaves narrowed at the base, petloled. 2. A. cannibinum. 



Leaves of the main stem truncate or subcordate at the base, sub- 

 sessile. 3. A. hypericifoliuni. 



1. Apocynum androsaemifolium L. 



In the northwestern part of the state. Belmont; Harrison; Weeping 

 Water. 



2. Apocynum cannibinum L. 



Common throughout the state. Belmont; Cherry County; Dixon 

 County; Kearney County; Lincoln; Nattick; Red Cloud; Talmage; 

 Wymore. 



3. Apocynum cannibinum hypericlfollum (Ait.) Gray. 

 Apocynum hypericlfollum Ait. 



Common over the whole state. Grand Island; Lincoln; Riverton. 



4. ASCLEPIADACEAE. 



Erect or decumbent herbs, corona segments terminating in concave 

 hoods. 

 Corona with an incurved horn in the cavity of each hood. . 



1. Asciepias. 



Corona without horns in the hoods. 



Cavity of the hood divided by a crest-like partition, corolla lobes 



spreading. 2. Asclepladora. 



Cavity of the hood not divided by a crest-like partition, corolla 



