National Geographic : 1891 May 29
200 I. C. Russell-E2pcedition to Mount St. Elias. some forms of the living S. rostrata,Richardson, with entire leaves. It is clearly a willow, but closer identification must remain for more complete material. " Number 3, represented by four or five specimens, is broadly elliptical in outline, and is also clearly a Salix. It is unlike any fossil form with which I am familiar, but is very similar to the living S. nigricans,For., var. rotundifolita, and to certain forms of S. silestaca, Willd. The nervation is very distinctly preserved, and has all the characters of a willow leaf. "Number 4, represented by three or four very fine specimens, is a very large leaf, measuring 13 cm. in length and 3 cm. in width at the broadest point. It may be compared with Salix macrophylla, Ileer,* but it cannot be this species. It is also like some of the living forms of S. nigra,Marsh., from which it differs in having perfectly entire margins. " While it is manifestly impossible, on the basis of the above identifica tions, to speak with confidence as to the age or formation containing these leaves, it can hardly be older than the Miocene, and from its strong re semblance to the present existing flora of Alaska it is likely to be much younger." [F. II. Knowlton.] Very sincerely yours, LSTEiR F. WARD. *Tert. Fl. Helv., vol. II, 1835, p. 29, pl. lxvii, fig. 4.
1892 Feb 19