CHAPTER XIX: THE WALNUTS AND 

 THE HICKORIES 



Family Juglandace^ 



Genera, JUGLANS and HICORIA 



Resinous, aromatic trees with hard wood. Leaves deciduous, 

 alternate, pinnately compound. Flowers monoecious: staminate 

 lateral, in catkins; pistillate terminal, in spikes, or solitary. 

 Fruit, a bony nut enclosed in a spongy husk. 



KEY TO GENERA AND SPECIES 



A. Pith of twigs chambered; husk not opening at maturity; 

 nuts not smooth. 



I. Genus JUGLANS, Linn. 

 B, Fruit elongated, clammy, in racemes; heart wood light 

 brown. {J. cinerea) butternut 



BB. Fruit globular, not clammy; solitary or paired; heart 

 wood dark brown. 

 C. Nuts deeply and irregularly ridged, large. 



(/. nigra) black walnut 

 CC Nuts deeply furrowed, small, thick shelled. 



(/. rupestris) Mexican walnut 

 CCC Nuts faintly furrowed, small, thin shelled. 



(/. Californica) California walnut 

 AA. Pitii of twigs solid; husk opening by 4 valves; nuts smooth. 

 2. Genus HICORiA, Raf. 

 B. Bud scales many, overlapping, leaflets 3 to 9. 

 C. Buds small, I to -\ inch long; husk of nut thin. 



D. Twigs and leaf stalks smooth. (H. glabra) pignut 

 DD. Twigs and leaf stalks silvery pubescent. 



(H. Villo'sa) PALE-LEAF HICKORY 



CC. Buds large, ^ to i inch long, husk of nut thick. 

 D. Bark shaggy; twigs smooth. 



E. Branchlets stout, orange red; nuts large, 

 thick shelled. {H. laciniosa) big shellbark 

 EE. Branchlets stout, grey; nuts small, usually 



thick shelled. {H. ovata) little shellbark 

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