JUGLANDACEAE OF THE UNITED STATES. 39 
kernel of fair flavor, but frcqu(mtly abortive and replaced 
by a spongv mass. — Canada to the Groat Lakes and 
Kansas, south to Texas and Florida, — in upland-. — PI. 
II, 14, f. 7-1), 15, f. l-;3, 18, f. ;i-io. 
Oceasional nut-, ch^arly of this >pe('ies, oeeur with 
husUs part(-d to the h:i^v and 7 to 1-2 nnn.thi<-k, Miir-e-tinir 
hyhridity with o'-afn, hnX I have nut hr.u af,U' to Mmiy the 
tuTs from u hirh tli<y came. OthiT fruits .u^^<:c>t i)o>>iblc 
hybritUty with tlie })re('edinir siH'cics. 
tlu' autiunn of 18S>4, Dr. J. iSchneek, of Mt. Carniel, 
III. , and Mr. F. Keppert, of :Museatine, Iowa, .sent to the 
herbarium twigs and fruit of bottom land trees that ap{)ear 
to bo hybrids of this species with the Pecan.* The bark 
of the Iowa tree is described as being nuu h like that of the 
Mockernut, while the tree of Dr.' Sehneck is smooth- 
barked, resembling the Pecan. So far as I have seen them 
the twigs of both might pass for those of alba except that 
the outer scales of the terminal buds are persistent, while 
the foliage, though intermediate, is strongly suggestive of 
that of the Pecan. The fruit is oblong, almost 2 in. long, 
the husk 6 mm. thick, parted nearly to the base, with 
strongly elevated margins to the segments, and rather per- 
sistent on the tree. The nuts are nearly as pale as in the 
Shagbark, c(mspicuously brown striped, slightly 4-eelled 
at the veiy base, ami with a wall only 1 mm. thick. A.s is 
u-ual in alba, they are upwardly attenuate, an<l fre.juently 
the kernel i^ ui)urtive. It is not impossible that these 
hybrids represent the Juglans rubra of Lamarck ( Illu.str. 
iii. 365, pi. 781, f. 4) and of Gaertner (Fr. pi. 89).— PI. 
21, 23, f. 2-5. 
++ ** Bark shaggy; outer bud scales persisting through the winter; 
nut angular and flattened from the side. 
= Fruit broader than long; husk moderately thick, not parted to the 
base. 
8. H. aiEXiCANA (Engelm.) Britton. Carya Meximna^ 
Engelmann. — A medium ^ized tree ; bark " apparently 
* On one of these see Sargent, Silva, vii. 138, 
