136 FORMS OF ROOTS. 
The internal structure of the root of Acrogenous plants in all 
essential characters resembles that of the stem in the same class 
of plants. 
Forms oF Roots.—When a root divides at once into a 
Fie. 262. 
Fye. 261. 
Fig. 261. Tubercular roots of an Orchis. Fig. 262, Palmated tubercules 
of an Orchis. 
Fic. 263. Fia. 264. 
Fig. 263, Fasciculated roots of the Dahlia.—-VFig. 264. Nodulose root of the 
common Dropwort (Spircwa Filipendula ). 
number of slender branches or rootlets, or if the primary root 
is but little enlarged, and gives off from its sides a multitude of 
similar branches, itis called fibrous. Such roots occur commonly 
