Tin Trees of Texas 4: 



etrr. frequently much .smaller, with stout branches, some- 

 what drooping and forming a beautiful, rounded, symmetrical 

 crown. Leaves 6'-$' long. The leaflets are long pointed, 

 sharply serrate, rounded or heart-shaped at base, sessile, glab- 

 rous or bearing tufts of hair in the axils of primary veins. 

 Fruit globose %'-lVi' in diameter with thin husk. The nut 

 is globose Avithout prominent ridges; the seed is sweet and 

 edible. 



Extends from the valley of the Colorado through western 

 Texas to California. 



The wood is dark brown or mottled, hard, coarse grained; 

 used in the manufacture of furniture. The tree is useful for 

 ornamental planting. It has been greatly improved by 

 hybridization with the European walnut to produce a beauti- 

 ful thrifty, quick growing tree, the Burbank walnut. 



2. HICORIA Rabinesque. The Hickories. 



Large, fine forest trees with very hard, tough, elastic wood, 

 and hard, fissured, tight, or scaly bark. The young branches 

 are flexible and not easily broken. The leaves are alternate, 

 deciduous, odd-pinnate with serrate margins. Fruit a hard 

 bony nut surrounded by a woody husk w r hich separates at 

 maturity into four segments. Staminate flowers clustered,, 

 usually on the wood of the preceding year; the pistillate in 

 spike-like clusters at the ends of the wood of the present 

 season. 



1. Bud scales few, valvate (in pairs), fruit with 

 more or less prominent ridges at the 

 sutures of the husk, shell thin except 

 in (3). 



(1) Leaflets 9-17, usually about 13; nut 

 ovate-oblong, circular in cross sec- 

 tion, kernel sweet and edible 1 H. pecan. 



(2) Leaflets 7-11, nut oblong, elliptic in 



cross section; kernel bitter 2 H. Texana. 



(3) Leaflets 5-9; shell of nut very thick 



(5) Leaflets 7-11; nut flattened, some- 3 H. myresticae-formis. 

 times broader than long 4 H. aquatica. 



(4) Leaflets 9-13; nut corrugated 5 H. cordiformis. 



-l Trees. 



