HARDY PERENNIAL PLANTS 221 



rockery. The flowers are small, blue and white ; very showy. It will 

 thrive in any kind of soil if kept slightly moist during dry weather. 

 In the latitude of Washington, D. C, it is perfectly hardy. 



Among the hardy Violas, V. papilionacea {ciicullata) is the species 

 most frequently grown in gardens. It often becomes a troublesome 

 weed and keeps on producing apetalous flowers long after the long- 

 stemmed showy blooms are gone, and from the short-stalked apetal- 

 ous flowers large capsules of seed follow in almost every instance. 

 V. pedata and its forms are among the earhest of our native species 

 to bloom. V. hlanda has pure white flowers, growing in dense tufts; 

 this species delights in sandy soil. V. pubescens is the common yel- 

 low sort with leafy stems, and V. rotundifolia has naked flower stems. 



Propagation. The various sorts may be increased by seed 

 or division. 



