516 OX SEEDLINGS 



narrow. Some of the cavities are still in process of excavation, and 

 the cortical matter is white while the rest of the endocarp is darker 

 and slightly tinted with green. The interior of the seed is lined 

 with jelly-like protoplasmic matter while the central hollow part is 

 occupied with a liquid. 



Seedling (fig. 661). 



Primary root very stout, woody, tapering downwards, subflexuose, 

 emerging from the apex of the nut, and furnished with lateral 

 rootlets. 



Hypocotyl very short, stout, woody, scarcely distinguishable from 

 the root. 



Cotyledons large, fleshy, obovate, bilobed, crumpled, filling the 

 whole cavity of the seed and remaining there after the germi- 

 nation of the plant, attached to the young plant by their short 

 fleshy petioles. 



Stem woody, erect, stout, compressed, glabrous, whitish beneath 

 the soil, deep green above and covered with little 

 grey or brown lenticels ; 1st internode 2-5 cm. 

 long ; 2nd 2'3 cm. ; 3rd 1-8 cm. ; 4th 2-5 cm. ; 

 5th and 6th each 1-6 cm. ; 7th 7 mm. These 

 lengths vary according to the vigour of the 

 seedling. 



Leaves compound, imparipinnate (first eight 

 in specimen reduced to scales and opposite or 

 subopposite in four pairs), cauline, alternate, 

 FIG. 661. exstipulate, petiolate, deciduous, glabrous ex- 



Jugians regia. cep t t u ft s o f h^ m the forks of the veins 



One- tenth nat. size. f . 



on the under side of the leaves of the adult 

 tree, deep green above, paler beneath, shining ; leaflets penninerved, 

 with alternate, ascending nerves incurved at their tips, alternate 

 or subopposite, and frequently not evenly paired, the odd one when 

 next the terminal leaflet apparently cut away from the base of 

 the latter, making it unequal at the base, more or less regularly 

 serrate in the young plant and quite entire in the adult tree ; 

 petioles subterete, tapering upward from a stout base, flattened on the 

 upper side and slightly channelled, but in the adult tree terete and 

 not flattened or channelled except at the dilated clasping base. 



Nos. 1-8. Reduced to small alternate or nearly opposite scales. 



No. 9. Trifoliolate ; terminal leaflet large, obovate, or elliptic, 

 cuspidate ; lateral leaflets small, oblong, alternate. 



No. 10. Five-foliolate ; terminal leaflet oblong-obovate ; middle 

 pair ovate, acuminate, oblique on the anterior basal side, unequal, 



