JUGLAXDE.E 517 



subopposite ; basal pair small, unequal, ovate, oblique on the 

 anterior basal side. 



No. 11. Four-foliolate ; leaflets alternate, all unequal ; terminal 

 one ovate-oval, subacuminate, very unequal at the base ; the other 

 three leaflets ovate, subacuminate, oblique on the anterior basal 

 side, much smaller than the terminal one. 



The serrate character of the primary leaves of the seedling is 

 very noticeable, as well as the fact that all or nearly all of the 

 primary or stronger lateral veins run to the tips of the teeth. 



Ultimate leaves imparipinnately three- to nine-foliolate ; leaflets 

 alternate or sometimes subopposite, unequal in size, entire, oblique 

 on the anterior basal side ; terminal leaflet much the largest, oblong- 

 elliptic, cuspidate ; lateral leaflets oblong or ovate-oblong, obtuse or 

 cuspidate or subacuminate, gradually smaller towards the base of 

 the leaf. 



M. Fleche has pointed out J that the young leaves differ in being 

 more acuminate, with nerves running to points, and altogether more 

 like those of some species of Carya. 



Juglans nigra, L. 



Ovary one-celled or partly four-celled at the base and apex, 

 one-ovuled ; ovule as in J. regia. 



Fruit globose, one-celled, or nearly four-celled by the projection 

 of ribs of the endocarp into the interior from the base and apex, 

 green, covered externally with little warts and sessile glands, tipped 

 with the persistent remains of the style and the superior perianth ; 

 epicarp fleshy ; endocarp bony, thick and projecting very much into 

 the interior of the fruit, with numerous shallow cavities on its 

 inner face ; placenta basal, one-seeded. 



Seed solitary, erect, deeply four-lobed ; lobes reniform or trans- 

 versely oval, constricted at their union with the central body of the 

 seed, projecting into each of the four large cavities of the ovary, 

 and raised into numerous gibbosities or swellings to conform to the 

 interior ; testa marked with numerous long, forking veins proceed- 

 ing from the basal chalaza and radiating all over the lobes to the 

 radicle, white or creamy yellow, double ; legmen paler, thinner. 



Endosperm absent in the mature seed, but in the young state 

 filling all the interior of the ovule with a clear, jelly-like mass on 

 the top of which the cotyledons lie astride with the radicle close to 

 the apex, and therefore distant from the hilum. 



Embryo straight, colourless, fleshy, ultimately occupying all the 



1 Bull. Soc. des Sciences, Nancy, 1886. 



