40 MISSOURI BOTANICAL GARDEN. 
scaly; ’’ twigs gray-brown, dull, glabrous, with numerous 
small but very evident pale lenticels; ‘* buds ovate acute, 
about one-fourth inch long, with pubescent scales, the 
outer acuminate, often with subulate points; ’’ fruit about 
an inch long, depressed; husk 6 mm. thick, splitting to 
below the middle; nut broader than high, mucronate at 
both ends, the apex truncate or depressed ; shell nearly white 
and of a chalky appearance, sharply angled, nearly 2 mm. 
thick, with very thick commissure; kernel? — Mexico, 
known only from Palmer, 835}, from the high mountains 
of Alvarez, twenty miles southeast of San Luis Potosi, at 
an altitude of 8,000 ft.— The only species not native to the 
United States.— Pl. 19, f. 1-3. 
In its husk characters and pubescence, this is most 
closely related to H. alba, but the bark (if really shaggy ), 
bud, leaf and nut characters, bring it close to H. ovata. 
= = Fruit subglobose or ellipsoidal; husk very thick, completely sepa- 
rating into 4 pieces; nut rather thin shelled, the kernel large and 
sweet.— In this group many of the petioles remain adherent to the 
twigs during the winter. 
- 
9. H. wactntosa (Michx.) Sargent. Carya_ sulcata, 
Nuttall.— The Bottom Shellbark.—A large tree; bark 
thick, light gray, coarsely flaking in very large scales with 
deep open sinuses, but usually less shaggy than in the next; 
twigs stout, buff or often nearly orange, mostly a little 
velvety or tomentose, with usually rather inconspicuous 
lenticels; terminal bud stout, with tomentose keeled outer 
seales; fruit ellipsoidal, two to two and a half inches long ; 
husk about 10 mm. thick, finely velvety pubescent; nut 
longer than broad, mucronate at both ends, yellow; shell 
about 2 mm. thick, the commissure firm; kernel sweet.— 
New York and Pennsylvania to Iowa, Kansas, and the 
Indian Territory, — exclusively in river bottoms.— Pl. 15, 
f. 4-5, 19, f. 4-5. | 
In the American Agriculturist for 1884, p. 546, f. 1, Mr. 
A. S. Fuller published an account of a supposed hybrid be- 
tween this species and the Pecan, which has been called the 
