POSITI V E I > E DC) 11 B L K M EN J'. 



95 



In the filbert or hazel (Gorylus Avellana) three 

 carpels are developed in the flower. Normally, 

 however, as the fruit matures, two of these become 

 abortive, so that the ordinary nut consists of a single 

 carpel. Now and again a nut appears which is con- 



Fig. 104.— Crocus sp. Diagram of flower with the formula 

 K3 C4A3 ( + 0) Gr 4 . 



siderably larger than usual and whose trilobed contour 

 shows it to be composed of the original three carpels 

 of the flower all equally or sub-equally developed 

 (fig. 105). 



The adhering disks of the tendril of the grape-vine 



Fig. 105. — Corylus Avellana (Hazel). Fruit with three almost equally- 

 developed carpels. Transverse section. 



(Vitis) are probably the modified swollen tips of the 

 pedicels of the inflorescence ; occasionally they revert 

 to the original condition and produce a grape. This 

 is one of the facts which prove the vine-tendril to be a 

 modified inflorescence. It must therefore be due to the 

 reappearance of floral members (carpels) which have 

 been completely suppressed (PL XXXVI IT, fig. 4). 



