VEGETATIVE ORGANS 



well drained rich soils they attain their maximum development. 

 In clayey soils roots penetrate only to short distances. When 



FlG, 7. — Panicum javanicum. 



the soil is rich and sandy roots go deeper and extend in all direc- 

 tions. The root-systems of most grasses are superficial and so are 

 best adapted for surface-feeding. 



The shoot-system. — The shoot-system varies with the duration 

 of the life of the plant. In annual grasses stems are in most cases 



