34 MISSOURI BOTANICAL GARDEN. 
mediate between the Pecan and Bitternut (HZ. minima), and 
they seem clearly to be hybrids of those species. The 
husk in most cases is intermediate in thickness between 
the two assumed parents. Hickorea Texana, Leconte * 
seems to be a similar hybrid, and the figure published by 
Leconte in his article represents quite well some of the nuts 
referred to above. Dr. Mohr ft has reported the Pecan as 
hybridizing with the Water Hickory, but I have seen no 
specimens indicating this hybrid. The Pecan further 
hybridizes in an interesting way with the Mocker Nut and 
the Bottom Shellbark, under which species the hybrids are 
considered. 
2. H. myristicaErormts (Michx. f.) Britton. Carya 
myristicaeformis, Nuttall.— The Nutmeg Hickory.— A 
medium sized tree; bark thin, dark brown-gray, falling in 
small scales or more shaggy and in netted flakes; twigs 
gray buff, dull, not hairy but at first densely covered with 
golden brown glistening peltate glands, the lenticels incon- 
spicuous; buds ovoid, densely brown scurfy, the tomentose 
inner scales of the terminal soon exposed; fruit about 1 in. 
long, ellipsoidal; husk 1 to 2 mm. thick, splitting nearly to 
the base; nut ellipsoidal, mucronate at both ends, brown or 
gray, conspicuously dark striped, 4-celled below; shell 
very hard, 1 to 2 mm. thick, the commissure firm but dark 
lined; kernel sweet, not ruminated.— Arkansas to Alabama, 
Texas and Mexico, and in South Carolina,—in wet bot- 
toms, occasionally extending into ravines and uplands; 
generally local.— Pl. 13, f. 7-9, 17, f. 1-4. 
++ ++ Nut usually as broad as long, very thin shelled, flattened, 
4-celled below. 
3. H. aquatica (Michx. f.) Britton. Carya aquatica, 
Nuttall.— The Water Hickory.—A rather small tree, 
becoming large in Arkansas; bark thin, light gray, shaggy 
* Proc. Philadelphia Acad. 1853, 402. 
+ Garden and Forest, 1889, 570. 
