The Trees of Texas 49 
eter, irequently much smaller, with stout branches, some- 
what drooping and forming a beautiful, rounded, symmetrical 
erown. Leaves 6’-9’ 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 34’-114’ in diameter with thin husk. The nut 
is globose without 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, 
deciducus, odd-pinnate with serrate margins. Fruit a hard 
bony nut surrounded by a woody husk which 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. 7 
1. Bud scales few, valvate (in pairs), fruit with 
more or less prominent ridges at the 
sutures of the husk, shell thin except 
m (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. myresticaeformis. 
times ‘prvuader: tan longi...) . Ss 4 H. aquatica. 
(4) Leaflets 9-13; nut corrugated....... 5 H. cordiformis. 
4—Trees. 
