KNowLTON.] DESCRIPTION OF SPECIES. 69 



Tbose leaves iiiay belong- to the preoediuo- species, but as they differ 

 in a number of minor particulars it has seemed best to keep them sepa- 

 rate. They are elliptical or slightly elliptical-obovate instead of ovate, 

 the teeth are liner, more regular, and evidently sharper pointed, and 

 the secondaries are at a stronger angle of divergence. 



Locality. —Van Horn's ranch, about 12 miles west of Mount Vernon, 

 Grant County, Oregon. Collected by Merriam's expedition of 1900. 

 (Type in Mus. Univ. Cal., No. 885.) 



Family MIMOSACE^E. 

 Acacia oregoniana Lesq. 



Acacia oregoniana Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 14, PL V, fig. 4, 1888. 



The type sj^ecimen with its counterpart still remains unique. 



Locality. — Van Horn's ranch. South Fork of John Day River, 12 

 miles west of Mount Vernon, Grant County, Oregon. Collected by 

 Maj. Charles E. Bendire (U. S. Nat. Mus., No. 2412). 



Family C^SALPINACE^ ? 

 Cassia ? sp. Newb. 



Cassia? sp., Newh., Later Extinct Floras, p. 113, PI. XLYI, fig. 10, 1898. 



The type of this form is before me and it requires but a glance to 

 see that the drawing does not correspond accurately with the speci- 

 men. Judging from the drawing alone it would seem to represent a 

 small leguminous pod with faint depressions corresponding to the 

 places occupied by the seeds. The outer surface is represented as 

 uniform and unmarked. The specimen itself does not show an}- evi- 

 dence of the presence of seeds, and the outer surface is strongly 

 marked with close parallel lines which are oblique to the long direction 

 and which completely cross it from side to side. I do not understand 

 this structure, and while it may represent a small pod it is hardly 

 probable that it is a Cassia. 



Locality. — Bridge Creek, Grant County, Oregon. Collected by 

 Rev. Thomas Condon (U. S. Nat. Mus., No. 7093). 



Family SIMARUBACE.E. 

 AiLANTHUS OVATA Lesq. 

 AiLANTHUs OVATA Losq., Cret. and Tert. FL, p. 254, PI. LI, figs. 7, 8, 1883. 



The type specimens only are known. I have examined these speci- 

 mens, both being preserved on the same piece of matrix. The figure 

 of the branch shows the buds much clearer than they appear on the 

 specimen, but it is perhaps correctly referred. The samaras are 



