IOWA ACADEMY OP SCIENCE 
79 
length from 4% to 6 inches, and in width from inches in the entire form to 
3% inches in the deeply lobed forms. The petioles vary from % to % of an inch 
in length, and are smooth or irregularly pubescent. 
The stigmas resemble those of Q. palustris in form and color. The sepals of 
the staminate flowers are mostly unequal, broad and somewhat lobed, in these 
characters resembling Q. palustris, but being narrower, and showing a some- 
what tapering rather abrupt tip which is somewhat laciniate tufted, in this 
respect approaching Q. imdricaria. 
The cup is intermediate in form and arrangement of scales and is almost 
smooth within. The acorn resembles some of the more spherical forms of Q. 
imhricaria and is also intermediate. 
It will be noticed that in form, dimensions and division of the blade, margin, 
venation, and lower surface of the leaf, the surface of the petiole, the form of 
the sepals, the form, arrangement of scales, inner surface and depth of the cup, 
and in the form of the acorn, the hybrid is intermediate between the parent 
species, sometimes approaching one, sometimes the other. The form and color 
of the stigmas, and the texture of the leaves are more nearly like those of 
Q. palustris, but the length of the petiole and the lower surface of the young 
leaf suggest Q. imhricaria. 
The accompanying plates I and II illustrate both the parent species and the 
hybrid. 
The hybrid here described is a double tree growing at the eastern edge of a 
mixed oak grove east of the railroad, in the south half of sec. 27, T. 78, R. VI W. 
The following oaks were found in this grove: Q. imhricaria, Q. palustris, Q. 
velutina, Q. macrocarpa, and Q. imhricaria x palustris. One of the oaks may 
be a hybrid, Q. imhricaria x velutina, but this was not satisfactorily determined. 
