32 FOSSIL FLORA OF THE JOHN DAY BASIN, OKEGON [bull. 204. 



This form i.s represented by a do^^en or more examples, among 

 which there is a considerable range in size. The smallest leaves 

 are only 2.25 cm. in length and 13 nnn. in width, while the larger 

 .are nearly 5 cm. in length and 1.75 cm. in width. The average size 

 is about 3.5 cm. in length and 1.75 cm. in width. The petiole is 5 

 or 6 umi. long. 



This species is certainly similar in general appearance to certain 

 forms of Salix Behhiana^ a species now widely distributed throughout 

 the Rocky Mountain area. 



Locality. — Mascall beds, Van Horn's ranch and vicinity, about 12 

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

 Knowlton and Merriam, July, 1901 (U. S. Nat. Mus., Nos. 8521, 8522, 



8523; 8524). 



Salix mixta n. sp. 



PI. II, figs. 11, 12. 



Leaves coriaceous in texture, ovate-lanceolate or ovate-elliptical in 

 shape, slightly unequal-sided, subcordate or abruptly rounded at base; 

 margin finely and evenly serrate; midril) thick; secondaries numerous, 

 rather close, i)arallel, emerging at a low, almost right, angle, curving 

 upward near the margin, strongly camptodrome, or occasionally with a 

 secondary ]:)assing to the margin; when camptodrome arching well 

 inside the margin with fine nervilles passing to the teeth; nervilles 

 numerous, mainly broken, at an oblique angle; finer nervation form- 

 ing a very regular fine mesh. 



This form is represented b}^ about a dozen examples, many of which 

 are quite perfect. The longest appear to have been about 8 cm. in 

 length and the smallest about 4 cm. The width is about 2 cm. The 

 petiole is not preserved in any case. The margin is uniformly serrate. 

 The secondaries are numerous, emerging nearly at a right angle on 

 one side of the leaf and an angle of 20^ or 30° on the other, all pass- 

 ing in the upper portion to an angle of about 45°. They are mainly 

 camptodrome, but occasionally one passes directly to the margin. 



These leaves undoubtedly belong to Salix and are so close to certain 

 described forms that it is difficult to determine whether or not they 

 should be regarded as new. 



Z(?C(2Z'%.— Mascall beds, Van Horn's ranch and vicinity, about 12 

 miles west of Mount Vernon, Grant County, Oregon. Collected l)y 

 Knowlton and Merriam, July, 1901 (U. S. Nat. Mus., Nos. 8525, 8526). 



Salix sp. ? Knowlton. 



PI. Ill, %. 1. 



Salix sp., Knowlton in Merriam, Univ. Cal., Bull. Dept. Geol., Vol. II, No. 9, 

 p. 303. 1901. 



A fragment that appears to belong to Salix. It is not sufficient to 

 settle its identity. 



Locality. — Three and one-half miles south of Lone Rock. Collected 

 by Merriam's expedition of 1900 (Mus. Univ. Cal., No. 1343). 



