DESCRIPTIVE LIST OF FLOWERS. 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. longiflora; an elegant biennial, if the roots can be 

 preserved through the Avinter, 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. historta^ an an- 

 nual Avith small yellow flowers, with a purple eye ; CE. 

 acaulU^ 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 spectabilis. — 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. 



