KNOWLTON.] DESCRIPTION OF SPECIES. 75 



This .species i.s not greatly unlike some forms of Acer irUolxiturn 

 trlcui<pldattim Heer" of the Swiss Miocene, 



I take great pleasure in naming- this species in honor of Dr. John C. 

 Merriam, who has done so nuich for the paleontology of this region. 



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

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

 by Merriam's expedition of 1900. (Type in Mus. Univ. Cal., No. S69.) 



AcEK, branches oil 



Acer, branches of ? Lesquereux, Proc. U. S. Nat. Mus., Vol. XI, p. 15, 1888. 



A number of branches supposed to l)elong to some species of Acer, 

 but it is quite impossible to determine which one. 



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

 Grant County, Oregon. Collected by Maj. Charles E. Bendire (U. S. 

 Nat. Mus., No. 2418). 



Acp:r orj:gonianum n. sp. 

 P1-. XIII, fig. 5-8. 



Acer, fruits of, Les(juereux, Proc. U. S. Nat. Mus., Vol. XI, p. 15, PI. VI, figs 2, 8, 



1888. 



Fruits long and broad-winged, the wing being evidently ver}^ thick 

 and provided with nimierous strong veins; nucleus large, round, show- 

 ing l)road truncation where attached to the sister fruit. 



This form is so very abundant in all collections from these beds and 

 admits so readily of separation that I have ventured to give it a name. 

 It of course represents the fruit of one of the species founded on 

 leaves that are also abundant in all collections, but thus far no fruit 

 has been found attached to or even approximate to a leaf, and until 

 so found it is more convenient to be able to refer to the fruits 

 independently. 



These fruits are, with the exception of that of Acer glgas (supra, p. 

 76), the largest ones found in these beds. They range in length from 

 3.5 to •i.o cm. The wing is unusuall}" broad, being not infrecjuently 

 1.75 cm. wide. It is filled with numerous strong veins, which are given 

 ofi' from the axis of the fruit in groups or bundles. 



As Lesquereux has well suggested, these fruits most closely resem- 

 ble those of the living Acer mdcrojjhyllum Pursh, the large-leaved 

 maple so common on the Pacific coast; in fact, they are hardly to be 

 distinguished. 



Locality. — Abundant in Mascall beds at Van Horn's ranch and 

 vicinity. All collectors have obtained it. Types of Lesquereux's fig- 

 ures in U. S. Nat. Mus., No. 2417. Types of figures in this paper 

 collected by Knowlton and Merriam, July, 1901, in U. S. Nat. Mus., 

 Nos. 8494-8497. 



" Fl. Tort. Ilelv., Vol. Ill, PI. CXII, fl;,'. 3. 



