248 DESCRIPTION OF SPECIES. 



which have apparently the character of this species, hut none of them is 

 seen in its whole length, and therefore the characters are not well defined. 

 One of them only, that near the base on the right side of the specimen, is 

 in a good state of preservation, and this is evidently shorter than are gen- 

 erally the leaves of S. angusta, and also more enlarged toward the base 

 and distinctly lanceolate. It also seems to be curved in the lower part 

 and unequal at base. The nervation is positively that of S. angusta, and 

 comparing it to fig. 5 of pi. xxii, loc. cit., the difference of size is not very 

 great. As all the fragments are upon the same piece of shale they seem 

 to belong to the same species and all to represent S. angusta. 

 Bab. — Old field claim, Oregon. 



Salix iuteg'ra?, Goepp. 



Plate LV, Fig. 7. 

 "U.S.Geol.Rep.," vii, p. 1G7, pi. xxii, figs. 1, 2. 



Though this leaf has the characters of the species and much resembles 

 that in Unger's " Schoss. Fl.," pi. xix, fig. 1, the identification cannot be 

 certain on account of the absence of nervation. It may represent S. tenera, 

 Al. Br., as described by Heer, "Fl. Tert. Helv.," ii, p. 32, pi. lxviii, figs. 

 7-13 — figs. 9, 13 especially being similar to it, only a little longer. 



Hob. — Corral Hollow, California. 



Pop nl us balsa in oides, G-oepp. 



Plate LV, Fig. 3-5. 



Supra, page 158. 



Leaves variable in size, cordate or elliptical-ovate, dentate; teeth curved upward ; 

 medial nerve thick. 



I have described in this volume, page 158, a fragment of leaf from 

 Florissant representing a variety of this species. We have here three 

 leaves of the same species, all very different in shape and size. Fig. 3 

 has the form and nervation of the leaves of P. balsamoides as figured by 

 Heer, "Fl. Tert. Helv.," pi. lxx, fig. 1, the leaf being only smaller and less 

 acuminate. Fig. 5 is somewhat like fig. 3 of the same plate, the base only 

 subcordate. The fragment, fig. 4, represents the variety eximia of Goepp., 

 " Schoss. FL," pi. xvi, fig. 5. 



Hab. — Corral Hollow, California. 



