MISSOURI BOTANICAL GARDEN. 
Nebraska, south to Texas and Florida, — in various situa- 
tions.— PI. 5, 6, 13, f. 10-12, 16, f. 4-6. 
Apparently the Bitternut hybridizes with the Pecan, 
the hybrids more or less closely approaching the former in 
twig and foliage characters and in the thinness of shell and 
the form of the nut, while they more nearly resemble the 
latter in the striping and nearly 2-celled structure of the 
nut, which, while less bitter than in true minima, is usually 
decidedly astringent. 
1. long), becoming snbglobose t 
s coiuiuoiily glandular dotted; 
glabrate, cherry colored to gray, slender for the group. 
5. H. GLABRA (Miller) Britton. Carya porcina. Nut- 
tall.— The Pignut.— A medium sized tree; bark thick, 
dark gray, checked much like that of the mature white 
ash; twigs purplish to dull gray, often without conspic- 
uous lenticels; buds reddish brown to gray, silky after 
parting the outer scale ; fruit about an inch long, pyrifonn, 
mostly apophysate, elliptical in cross section ; husk about 
1 mm. thick, rarely splitting far, and never below the 
middle ; nut ellipsoidal , not angled, pointed from the mostly 
sunken apex, usually mucronatc at tht; base, dirty brown; 
shell about 2 mm. thick, the < onmiis>ure ^tout ; kernel of 
inferior quality. Two forms of fruit occur, the longer 
marking the variety ^c(;^V>?-m/x, and the shorter the variety 
obcorduia, but the^e appear Ncarrely worthy of varietal 
separating .— So f-ir . .-. inipn^ show, limited to the 
Atluun^ , ■ - ' and Pcnn^vlvauia to 
Flori.;., 
