514 ON SEEDLINGS 



consists of three leaflets ; the second of five, and the third of 

 four ; but the number may vary according to the vigour of the 

 seedling. The leaflets are serrated, with nerves running 

 into the teeth, while those of the adult tree are entire, with 

 the principal nerves incurved and not reaching the margin. 



The cotyledons of Pterocarya caucasica are deeply bipar- 

 tite, and each of the primary divisions again divided for more 

 than half their length. The ultimate segments are oblong- 

 linear. Three out of five nerves terminate at the base of a 

 sinus, and the lateral ones of these fork, giving off a branch into 

 each of the ultimate segments. The first five leaves are simple, 

 lanceolate, acuminate and penninerved, while the ultimate 

 ones are pinnate with numerous pairs of leaflets, and an odd 

 one. 



Juglans regia, L. 



Pistil syncarpous, inferior, surmounted by the bract and 

 bracteoles which are adnate to it, forming a small three- to five- 

 toothed involucre. Higher up and inside of this involucre is the 

 small four-lobed perianth. 



Style very short, deeply bifid, with the two arms broadly linear- 

 oblong, blunt, spreading and recurved, stigmatic all along the upper 

 surface with wavy lamellae. 



Ovary of two carpels, one-celled, one-ovuled, with a small cavity 

 just sufficient to accommodate the ovule in the quite young state ; 

 ovule basal, erect, orthotropoug, in direct connection with the axial 

 vascular tissue ; micropyle superior. 



Fruit an ovoid drupe surmounted by the beak-like remains of 

 tbe style, densely pubescent in the young state at least, one-celled, 

 one-seeded ; exocarp fleshy, at length bursting irregularly, and fall- 

 ing off ; endocarp woody, forming tbe shell of tbe nut, which is 

 corrugated externally and deeply excavated or chambered internally 

 making the fruit appear two- to four-celled, indehiscent, but 

 separable into balves. 



Seed deeply two- to four-lobed at the base, tapering upwards 

 into a somewhat wedge-shaped but rounded or blunt point ; testa 

 membranous. 



Embryo large, fleshy, colourless, conforming to tbe seed, and that 

 again to the inner lining of tbe endocarp ; cotyledons four-lobed and 

 slightly auricled at tbe base, closely adpressed, wrinkled and appear- 

 ing like one continuous piece, constituting tbe greater part of the 

 embryo, subterranean in germination ; radicle superior, close under 



