DESCRIPTIVE LIST OP FLOWEKS. 301 



considered and treated in open air culture as a hardy 

 annual ; it has a succession of yellow flowers from July 

 to October. Two feet high. 



(E, tetraptera, White-flowered Evening Primrose. 

 A very beautiful, prostrate-growing, hardy annual from 

 Mexico. One foot high, with a succession of pure white 

 flowers from July to September, which make their appear- 

 ance after the sun has descended below the horizon, and 

 perish before it rises in the morning. 



(E. loilgiiloraj an elegant biennial, if the roots can be 

 preserved through the winter, but generally cultivated as 

 an annual, with uncommonly large and showy yellow 

 flowers from July to October. A native of Buenos Ayres. 

 Three feet high. 



Besides these there are cultivated : (E. bistorta, an an- 

 nual with small yellow flowers, with a purple eye ; (E. 

 acaulis, a prostrate white-flowered species from Chili ; (E. 

 Lamarckiana, a tall species with large yellow flowers ; 

 and others. All the species are propagated without dif- 

 ficulty. The annuals by seed, and the perennials by seed 

 or from divisions of the root. 



ORCHIS. 



[The ancient Greek name.} 



We have only one species of Orchis proper in the 

 United States, those which are popularly so called belong 

 to the genus Platanthera. 



Orchis spcctabilis. Showy Orchis. A low species, 

 with a root of fleshy fibres from which are produced two 

 fleshy oblong leaves and a flower-stem about six inches 

 high, bearing several white and pinkish-purple flowers, in 

 May. For remarks on culture, see Platanthera. 



