JUGLAXDE.-E 



507 



bract and bracteoles enlarged at its base, or partly or wholly 

 adnate to its sides or even carried to the top forming an invo- 

 lucre ; in other cases these organs remain unchanged and fall 

 away. The exocarp is fleshy or succulent, generally falling 

 away when mature, leaving the bony endocarp which is 

 variously excavated into two or four cavities internally. The 

 seed is two- to four-lobed at the base and lies astride the 

 placenta with its lobes passing down into the cavities of the 

 endocarp. Endosperm is wanting, and the embryo conforms 

 to the interior of the seed. The cotyledons are fleshy and 

 crumpled, or sometimes foliaceous and much folded and 

 twisted, and the radicle is superior. 



I have already described and figured the seed and seedling 



FIG. 654. Fruit of Pterocar 

 P, perianth ; W, W, wii 



FIG. 655. Longitudinal section through 

 the flower of Pterocarya caucasica, x 6 : 

 -B, bract ; B', B', bracteoles ; Ov, ovule ; 

 P, perianth ; St, style ; S, S, stigmas. 

 May 23. 



of Peterocarya caucasica, 1 which are very peculiar. I have to 

 thank Mr. Lynch for his kindness in keeping me supplied with 

 specimens of the fruit in its various stages from the tree 

 in the Cambridge Botanic Gardens. The seed 2 is shaped 

 somewhat like an anvil, with four short, wide legs ; and the 

 seedling is remarkable in having the cotyledons bifid, each 

 division being again bilobed. 



Pterocarya caucasica flowers with us early in May. The 

 pistil is syncarpous and inferior ; the ovary of two carpels, one- 

 celled, one-ovuled ; the ovule basal, erect, and orthotropous. 



Fig. 655 is a section through the young flower at the end of 

 May, showing a bract B at the base, two bracteoles B' B' at the 



1 Journ. Linn. Soc. Hot. vols. xxii. and xxviii. 



2 Ibid. vol. xxii. p. 386, fig. 118. 



