208 



BUDS AND STIPULES 



But there are some undoubted stipules which con- 

 tain no fibres, as Colomb himself says in another place, 

 speaking of Polygonum. 



The history of the early development of the young 

 stipule shows, indeed, I think conclusively, that it 

 cannot be regarded as a separate and independent 

 organ. We must, then, I think, adopt the third view, 

 viz., that stipules are an integral part of the leaf. 



Fig. 31 ( J. Tkansvi kse Sec- 

 tion of Stem of Galium 

 Aparine at a Node. 



Fig. 320. Plane (Platanus 

 orientalis). Nat. size. 

 a a, axis ; P, petiole of leaf ; Sh, sheathing 

 or concave base, covering the axillary 

 bud ; 0, ocrea ; L 0, lamina of ocrea. 



I now proceed to consider certain organs which 

 must be included amongst stipules, although they 

 diverge widely from the ordinary form and arrange- 

 ment. 



The Ocrea 



The sheath or ocrea of the Planes, Polygonum, &c, 

 is generally, and, I think, correctly, regarded as a form 



