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. 



a Q 



FIG. 319. TRANSVERSE SEC- FIG. 320. PLANE (Platanus 



TION OF STEM OF GALIDM orientalis). Nat. size. 



APARINE AT A NODE. 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 



