THE ORNAMENTAL PLANTS —PERENNIALS 263 



Elecampane, Inula Helenium (Fig. 251). 



Wild sunflowers, Helianthus * of different species, especially H. orygalis, 

 H. giganteus, H. grosse-serratus, H. strurriosus. 



251. Elecampane, Naturalized in old fields and along roadsides. 



Compass-plants, Silphium* of several species, especially S. terebiw 



thinaceum, S. laciniatum, S. perfoliatum. 

 Sacaline, Polygonum Sachalinense. 

 Japanese knotweed. Polygonum cuspidatum. 

 Bocconia, Bocconia cordata. 

 Wild wormwood. Artemisia Stelleriana * and others. 



