76 FOSSIL FLORA OF THE JOHN DAY BASIN, OREGON. [bui,l.201. 



Acer medianum n. sp. 

 PI. XIV, figs. 4, 5. 



Fruit largo, lanceolate in shape; wing rolativel}" narrow, filled with 

 thin v^eins; nucleus round or oblong, the scar of attachment to its sister 

 fruit very oblique. 



This provisional species is represented by the two examples figured. 

 The smaller is 4.25 cul long and has the wing 1 cm. wide; the other is 

 4.75 cm. long and has a wing 1.25 cm. wide. 



It is possible that there are merely very hirge fruits of the following 

 species, as they are of approximately the same shape, but there are no 

 intermediate specimens, and I have preferred to keep them separate 

 for the present. 



Locality. — Figure 4, the smaller, is from the original Van Horn's 

 ranch locality; the other is from the white hill, one-half mile east of 

 the first locality. Collected by Knowlton and Merriam, July, 1901 

 (U. S. Nat. Mus., Nos. 8498, 8499). 



Acer minor n. sp. 



PI. XIV, %f^. 2, 3. 



Acer^ fruits of, Lesquereux, Proc. U. S. Nat. Mus., Vol. XI, p. 15, PI. VII, fio;. 2, 



1888. 



Fruits of small size, similar in shape to the preceding species; 

 length, 2.5 cm., width of wing, 8 mm. 



As already stated, this ma}- be the same as the preceding form, but 

 the specimens are so much smaller, and moreover, as there are no 

 intermediate specimens, it has seemed best to regard them as distinct. 



Inasmuch as three species have been ditierentiated in these beds, 

 based on leaves, it is natural to suppose that the fruits might also 

 show difi'erences, In any case it would seem easy to recognize the 

 three forms of fruits here described. 



Locality. — White hill one-half mile east of original Van Horn's 

 ranch locality, Grant County, Oregon. Collected by Knowlton and 

 Merriam, July, 1901 (U. S. Nat. Mus., Nos. 8500, 8501). 



Acer gigas n. sp. 

 PL XIV, fig. 1. 



Fruit of enormous size, very narrow; wing of nearly similar width 

 throughout, filled with numerous but rather fine veins; nucleus very 

 large, elliptical in shape. 



This fine species is represented thus far by the single example 

 figured, with its counterpart. It is a very long, narrow fruit, 9.5 cm. 

 in length and only about 1.5 cm. in width. The nucleus or seed 

 proper is large, being 2 cm. in long, and nearly 1 cm. in short, diameter. 



