Herbaceous Plants 



291 



ure. If well cut back when through flowering, it often 

 gives a second crop of flowers. R. Xewmanii, the perennial 

 form of the Black-Eyed Susan, attains a height of 3 feet, 

 and the deep orange-yellow flowers with a dark purple 

 cone add variety to the flower border. R. purpurea (Giant 

 Purple Cone Flower) has peculiar reddish-purple flowers 



Fig. 166. — Yucca filamentosa. 



with a large brown cone-shaped center, and blooms from 

 July to October. 



Sunflower (Heliantlms). — IVIany of the hardy sun- 

 flowers are useful perennial plants. The plants of some 

 species are tall, 5 to 12 feet, with large or very large 

 attractive yellow flowers. Some kinds spread too rapidly 

 to be desirable unless planted in a box or tub of soil. The 

 plants are easily propagated by division. Planted in masses, 

 sunflowers are very effective. Helianthus decapetaliis, var. 

 multiflorus , and its garden varieties do not spread so rapidly 



