134 CONTRIBUTIONS TO PALiEONTOLOGY 



Family SALICACEiE 



Genus SALIX Linn6 



Salix lancensis Berry 



(Plate 7, Figs. 2, 5, 7, 8; Plate 8, Fig. 3) 



Salix laTu-ensis Berry, U. S. Geol. Surv. Prof. Paper 185-F, 130, pl. 25, fig. 8, 1934. 

 Salii sp., Knowlton, Proc. Washington Acad. Sci., vol. 11, 207, 1909. 



There are nearly a hundred specimens, from six localities, which agree closely with the speci- 

 mens which Berry described and figured from the lower Lance (Hell Creek) formation of Harding 

 County, South Dakota. The Lance Creek specimens apparently differ only in the somewhat 

 more widelj' spaced marginal teeth. Since the marginal characters of the Harding County speci- 

 mens are poorly preserved, it may be that more adequate specimens would reveal the same kind 

 of teeth as are seen in those from the Lance Creek area. 



There are apparently no other later Cretaceous or early Tertiary species of <SaKx with which 

 these specimens can be compared. There is a possibiUty that they may be slender forms of 

 Fraxinus leii Berry, from which they appear to differ mainly in their very lanceolate shape and 

 their more numerous secondaries and marginal teeth. 



The generic reference to Salix seems reasonably justifiable. 



OccMTTence— LocaUties P3652, P3853, P3854, P3857, P3859; U. S. Geol. Survey LocaUty 1469. 



Colledion—lJ. S. National Museum, Plesiotypes Nos. 40251, 40252; U. C. Mus. Pal., Plesio- 

 types Nos. 2493, 2494, 2495. 



Genus SALICIPHYLLUM Fontaine 

 Saliciphyllum wyomingensis (Knowlton and Cockerell) Dorf, n. comb. 

 (Plate 8, Fig. 5) 



Salix wyomingensis Knowlton and Cockerell, U. S. Geol. Surv. Bull. 696, 572, 1919. Knowlton, U. S. Geol. 



Surv. Prof. Paper 130, 125, pl. 4, figs. 3, 4, 8, 1922. 

 Salix inlegra Goeppert, Ztschr. Deut. geol. Gesellsch., vol. 4, 493, 1852. Lesquereux, U. S. Geol. and Geog. 



Surv. Terr., Ann. Rept. (1873), 397, 1874; Rept. U. S. Geol. Surv. Terr., vol. 7, 167, pl. 22, figs. 1, 2, 



1878. 

 IQuercus cinereoides Lesquereux, Rept. U. S. Geol. Surv. Terr., vol. 7, 152, pl. 21, fig. 6, 1878. Knowlton, 



Proc. Washington Acad. Sci., vol. 11, 207, 1909. 

 Laurus lakesii Knowlton, U. S. Geol. Surv. Prof. Paper 130, 144, pl. 22, fig. 6, 1922. 



There are 3 specimens which are sufficiently complete to indicate their identity with the 

 tj'pe and figured specimens of Salix wyomingensis froni the Black Buttes and Laramie floras. I 

 have also seen the specimen from the Lance formation which Knowlton referred to Quercus 

 cinereoides and find it indistinguishable. The original type specimen of Q. cinereoides ("LocaUty 

 unknown") is not to be found in the coUection at the U. S. National Museum, hence I have 

 questioned its reference to the new combination. I can see no justifiable basis of distinction 

 for the Laramie specimen described by Knowlton as Laurus lakesii, which was coUected from the 

 same locaUty as several specimens of Salix wyomingensis. 



This somewhat generaUzed leaf form may be distinguislied from other species of slmilar 

 shape by the number and the high angle of its secondaries, which loop abruptly upward near the 

 margins, by its indistinct tertiary venation, and by its entire margins. It resembles, except for 

 its tertiary venation, the speciraens from Evanston, Wyoming, which Lesquereux referred to 

 Laurus primigenia Unger.' 



A definite reference of this species to the existing genus Salix seems unwarranted. Its 

 characters seem equaUy lauraceous.- Pending more definite comparisons, it is advisable to refer 

 it to the form genus Saliciphyllum, indicating only a similarity to the leaves of Salix. 



Occurrence — LocaUty P3857. 



CoUedion—V. C. Mus. Pal., Plesiotype No. 2496. 



' Lesquereux, L., Rept. U. S. Geol. Surv. Tcrr., vol. 7, 214, pl. 36, figs. 5. 6, 8, 1878. 

 ' Cf. Lit»ea glaucescena H. B. and K., New York Botanical Garden, Noa. 7352, 1489. 



