Araha. DISCANTHE. 21 
This species seems to have been extensively distributed in this flora, 
for it is represented by numerous specimens from divers localities, pre- 
senting always, as far as that may be recognized by the fragments, the 
saine characters and the same large size of leaves. The genus Aralia has 
its origin in the Cretaceous; numerous species of Araka and Aralopsis 
have been described from the Dakota group, one of which, A. Zowneri, 
has, like this, entire lobes, and a nervation of the same character. The 
relation of our species, however, is more definite with A. afimus and its 
closely allied congener A. nolata, of the Eocene, which is locally as widely 
distributed as that of the Chalk Bluffs, for in some localities specimens 
of this species only have been found in abundance. 
The same type is represented in the European Miocene by Araha (Pla- 
tanus) Hercules, Ung. Chlor. Prot., p. 138, Pl. XLVI, and at the present 
time by some species of the section of the Oreopanaz, especially by the 
beautiful Arala papirifera of China and Japan, whose leaves are of the 
same form, and generally still larger than those of the fossil species. 
Habitat. — Chalk Bluffs, Nevada County, California. Voy’s Collection. 
Represented also by more than one half of the specimens of the collection 
of Professor J. D. Whitney. 
Aralia Zaddachi? Heer. 
BO V.. Figs. 2,3. 
Leaves comparatively small, subcoriaceous, five-lobed, rounded to and cordate at the base, 
distantly obtusely dentate secondary nerves at an acute angle of divergence. 
The consistence of these leaves is somewhat thick; the primary tri- 
palmate nervation, from the base of the petiole, gives a five-lobed divis- 
ion of the lamina by the forking of the lateral primary nerves in branches 
of equal thickness. Contrary: to what is remarked in the former species, 
the middle nerve is thicker than the lateral ones. The lower secondary 
veins, at an acute angle of divergence, either follow the borders and 
curve along them when they are entire, or enter the obtuse, distant 
teeth, distinct from near the cordate base of the leaves in Fig. 2. The 
upper secondary nerves are somewhat more open and more curved in 
passing to the borders. The lobes which reach to the middle of the 
lamina are oblong, slightly enlarged in the middle, lanceolate-acuminate, 
and distantly dentate below the point which is apparently entire, as seen 
