174 



MINUTE STRtrCTtJRE O** THE FLOWEE. 



489. But if the ovaries, instead of being superior, as those in 

 Fig. 133, are inferior, as tliose in Fig. 134, furtlier complications 

 are caused. The fibro-vaseular bundles of the several floral 

 whorls united with the pistil are distributed in cu-cles in the 

 parencliynia tissue of the ovary. Thus in Fig. 134 a, we find 

 Ave such circles, corresponding to the calyx, corolla, stamens, 

 and dorsal and ventral sutures of the carpel. The bundles in 

 Fig. 134 a are arranged in radial lines from the centre outwards ; 

 the six bundles nearest the centre of the ovary are those of the 

 ventral sutures, and have wood outside and liber inside ; in the 

 next circle the three with reverse arrangement of elements are 

 those of the dorsal sutures from which the bundles just spoken 

 of branched. In Fig. 134 b, all the fibro-vascular bundles save 



those of the carpels 

 'e \ u ^ are united to form a 



single circle, thus giv- 

 ing rise to the three 

 circles of bundles 

 seen in the cross- 

 section, and at the 

 base of the ovary 

 even these did not 

 exist separate. In 

 Fig. 134 c, the bun- 

 dles of all the floral 

 whorls are blended 

 for a considerable 

 height in the ovary ; 

 finally, the bundles 

 of the ventral sutures 

 become separated 

 from the rest, which 

 continue united 

 throughout, formmg 

 the large buurlles seen on the periphery of the ovary in Fig. 

 134 c. The arrangement of the bundles in this figure should be 

 compared with that in Fig. 133. 



490. The structure of the peduncle and the pedicels is sub- 

 stantially the same as that of the stem, and the structure of 



Fig. 134 Transverse section of the inferior ovary, allowing tlie arrangement of libro- 

 vascular bundles both in the carpels and the external parts of the flower: a, AlstrcB- 

 meria versicolor, the fascicles of the whorls independent; 6, Galanthus nivalis, the 

 fascicles no longer so distinctly radial; c. Campanula Medium, the fascicles of the 

 whorls blended. (Van Tiegbem.) 



