KNowLTON.] des(;rii'tion of spkcies. 31 



Salix pseudoargextea n. ,sp. 



PI. II, figs. 2-4. 

 Sapindus cmgustifolms Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 15, 1888. 



Leaves of firm texture, lanceolate or narrowly ovate-lanceolate in 

 .shape, narrowed a})out e(inally to both base and apex; margin per- 

 fectly entire: petiole short, rather slender; midrib rather strong; 

 secondaries numerous, some 12 or 15 pairs, at an acute angle, thin and 

 nearly concealed in the substance of the leaf, camptodrome; finer 

 nervation not preserved. 



I refer a large number of specimens to this form, among them one 

 that was identified by Lesquereux as Sapindits angustifoUus. They 

 are mainly small, narrow leaves from 4 to 6 cm. in length and from 

 1 to 1.5 cm. in width. The petiole is 5 mm. long, and, as stated 

 above, slender for the size of the leaf. This form has a close resem- 

 blance to the living Salix argentea. 



Locality. — Mascall beds, Van Horn's ranch, about 12 miles west of 

 Mount Vernon, Grant County, Oregon, Collected by Knowlton and 

 INIei-riam, July, 11)01 (U. S. Nat. Mus., Nos. 8527, 8528, 8529). 



Salix dayana n. sp. 



PI. II, figs. 9, 10. 



Leaves of firm texture, ovate-lanceolate or elliptical-lanceolate, 

 truncate or slightly heart-shaped at base, acuminate at apex; margin, 

 perfectly entire; petiole very short, stout; midril) thick; secondaries, 

 10 or 12 pairs, at an angle of al)out Ki'-, thin and obscure, cam})to- 

 drome, arching and joining well inside the margin; finer nervation not 

 retained. 



I refer three examples to this form, two of which are here figured. 

 The smaller is 1.5 cm. long and 1.5 cm. wide, the larger 5.5 cm. long 

 and nearly 2 cm. wide. The petiole is about 2 mm. long. 



Locality — Mascall beds, Van Horn's ranch, a))out 12 miles west of 

 Mount Vernon, Grant County, Oregon. Collected by Knowlton and 

 Merriam, July, l!»Ul (U. S. Nat. Mus., Nos. 8580, 8531). 



Salix pekplexa n. sp. 



PI. II, figs. 5-8. 



Leaves of firm texture, obovate-lanceolate to elliptical-lanceolate 

 in shape, narrowed, often abrui)tly, to the petiole, rather o})tuse at 

 apex; margin entire; petiole short; midrib strong below, becoming 

 very thin above; secondaries numerous, 12 or 15 pairs, alternate, at a 

 low angle, parallel, effaced near the margin, but apparently campto- 

 drome; finer nervation obscure, but apparently producing very tine 

 areolae. 



