KNowLToN] DESCRIPTION OF SPECIES. 29 



as I'odozaiiiitvs ohloiu/us^ from tlii' Dakota oroup of Kansas, l)ut this is 

 without the prominent ribs seen in our specimens. This resembkince 

 can hardly be more than superticial, and we nuist await future material 

 before the status of these specimens can becletinitely settled. 



Locality. — Bridge Creek, Oregon. Collected l)y Merriam's party of 

 1900 (types in Mus. Univ. Cal., Nos. 250O, ^>:m). 



Family SALIC ACE.E. • 



PoPULUS Linj)(;kem Knowlton. 



PI. II, fig. 1. 



Poi'ULi's LiNDGRENi Kiiowlton, Eighteenth Ann. Kei)t. V. S. Geol. Snrv., Pt. Ill, 

 p. 725, PI. C, fig. 3, 1898. 



The collections from near Van Horn's ranch, made during the season 

 of 1901 by Dr. Merriam and myself, contain a single very perfectly 

 preserved leaf that must be referred to this species. It differs slightly 

 from the type in being more nearly circular in shape, but in matter of 

 size, marginal teeth, and nervation the two specimens are identical. 



Locallt;/. — White hill one-half mile east of original Van Horn's 

 ranch localit}^, Grant County, Oregon. Collected b}^ Knowlton and 

 Merriam, July, 1901 (U. S. Nat. Mus., No. 8512). Type specimen 

 from 2 miles southeast of Marsh post-office, Boise County, Idaho 

 (U. S. Nat. Mus., No. 8292). 



Salix Schimperi Lesq. 



Salix Schimperi Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 21, PI. XIII, fig. 5, 1888. 



Locality. — Cherry Creek, Crook County, Oregon. Collected by 

 Maj. Charles E. Bendire (U. S. Nat. Mus., No. 2595). 



Salix Engelhardti Lesq. 



Salix Engelhardti Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 17, PI. VIII, fig. 2, 1888. 

 Cassia phascolites f Ung. Lesquereux, idem., }>. 16. 



It seems doubtful if this is correctly referred to Salix, l)ut as no new 

 material except a specimen to be mentioned ))elow has come to light, 

 it may be best to retain it as left by its author. 



It was observed that the single example referred by Lesciuereux to 

 Cassia phaseolites f Ung. had a serrate margin, which would exclude it 

 from this genus, and a further comparison convinces me that it is 

 another leaf of Saliir ErujrllKUHUL It is a small leaf, not quite so 

 broad relatively in the upper part, but it has a base of the same shape, 

 the same serrate margin, and the same nervation as this species, and 

 is therefore referred to it. It becomes then the second known speci- 

 men of S. Engelhardti, 



