THE AM ERIC AX XA TURA LIST. [Vol. XXXV ] I. 



tion from yellow to blue is shown in G. purpurea, w hich is yellow 

 inside and blue outside. A number of species by the lengthen- 

 ing and narrowing of the corolla have become adapted to Lepi- 

 doptera alone, or to bumblebees and Lepidoptera, but the blue- 

 color it is noteworthy has been retained. In the genus Sabbatia 

 the handsome flowers are wheel-shaped, and the coloration seems 

 to have changed from yellowish to white or pink, or pink-purple. 

 .V. lauccolata and .V. pauiculata are white turning yellowish in 

 fading ; and .V. ait^ustifoha and .V. campauulata are pink with a 

 yellowish eye. Several of the rose-colored species are sometimes 

 white. In' Erythraea the slender funnel-form flowers are as the 

 name of the genus denotes usually red. In Fraseja carolimnsis 

 the rotate corolla is light greenish yellow with brown purple dots. 

 Hartonia which grows in swamps and meadows shows evidences 



The flowers are small and white or yellowish. 



The Menyanthaceae are marsh or aquatic plants, which in our 

 species have yellow or white flowers. The flowers of Limnan- 

 themum (floating-heart) are short-lived. As the petals wither 

 they become pulpy and exude a thin layer of liquid which is 



The Apocynaceas are confined chiefly to tropical regions. 



one purple and two are blue. The dogbanes (Apocynum) have 

 small, bell-shaped, white, or pink flowers in cymes. The pinkish 



white species are visited by numerous bees. Viuca_miuor, or 

 the myrtle, is blue, while V. rosea from the West Indies is rose 

 or white. Both species are fertilized by bees. The Oleander 

 (Xerium) cultivated from the Levant has large, scentless, showy 

 rose-colored flowers that are fertilized by the hawkmoth Sphinx 

 nerii. The caterpillar of this moth lives exclusively upon the 

 leaves of the oleander. The species of this family in the north 



insects to their coloring. 



Like the preceding family the Asclepiadacea- are most abun- 

 dant in the tropics. There are n white, 3 yellow, 5 red, 13 



