WAYSIDE WEEDB. 



147 



lower part J and according to the shape of this 

 caudex they are classed as conical, spindle-shaped, 

 globular, etc. In the last-mentioned cases, the 

 fleshy portion of the root forms part of the central 

 root-stem, or axis ; but in tuberous-rooted or tuber- 

 bearing plants, as the orchis (Fig. 92), the dahlia, 

 some ranunculuses, etc., the fleshy portions are 



Pie. 93.— Boot of Bird's-nest Orchis : «, flbre-ilifl tubers; 

 i, fibres or rootlets. 



attached as appendages or tubers, and the rootlets 

 enter the plant above them, and not at their lower 

 end. The fascicled root, such as we find in the 

 bird's-nest orchis (Fig. 93), is simply a tuberous 

 root, only the tubers are long, thin, and numerous. 



