DESCRIPTION OF SPECIES— SALIOINE^. 167 



Salix inte§:ra, Goepp. 



Plate XXII, Figs. 1, 2. 



Salix inief/ra, Goepp., Schoss. Tert. Fl., p. 25, figs. 6, 10, 14. — Lesqx., Annual Report, 1873, p. 397. 



Leaves small, entire, oblong, lanceolate-acuminate, gradually narrowed to a short petiole; lateral 

 veins thin, close, intermixed with short tertiary ones; primary areoIiB large, quadrate. 



The leaves of this species are generally small. Those figured by Goep- 

 ' pert vary from one to four and a half centimeters long and proportionally broad ; 

 those described here being therefore of the largest size. The nervation, as 

 seen in figs. 1 and 1 a, enlarged, is that of the genus, agreeing entirely with 

 that represented by the European author, especially in fig. 1. The only nota- 

 ble difference of characters is in the more gradually tapering acumen of the 

 American leaf, and this is not of specific value for a species whose leaves are 

 greatly variable in size and form, some of them being obtuse or even half- 

 round at the point, while some others are sharply acuminate or pointed. 



From Heer's remarks on this species in Fl. Tert. Helv., iii, p. 175, the 

 leaves represented by Goeppert {loc. cit., figs. 2, 3, 4, 8, 9), with more distant 

 and stronger secondary veins, without intermediate tertiary ones, are refera- 

 ble to Benzoin attenuatum, Heer {loc. cit., ii, p. 82, pi. xc, fig. 10), to which 

 he refers also the leaves described in the same volume (p. 32, pi. Ixviii, figs. 

 20-22) as Salix Integra. We have apparently here the two forms described 

 and figured by Goeppert, one (fig. 1) identical in characters with fig. 1 of the 

 Schossnitz Flora, as remarked above, and one (fig. 2) showing quite as dis- 

 tinctly the characters of fig. 2 of Goeppert's, for it has the secondary veins 

 more distant and no trace of intermediate tertiary veins. The habitat of 

 these leaves being the same, I consider the difference as merely apparent, 

 resulting from the more imperfect state of preservation of the leaf in fig. 2. 

 Specimens from Golden, and also from the Miocene of Oregon, have the same 

 character of nervation, and a short, naked petiole. The typical characters of 

 Benzoin attenuatum, viz., the border base decurrent along the petiole, which 

 is therefore winged, and the lower lateral veins at a more acute angle of 

 divergence, and following the borders to the middle of the leaf, as indicated 

 in Heer's loc. cit., pi. xc, fig. 10, are not seen upon any of the American 

 leaves. 



Habitat. — Black Buttes, Wyoming, the two specimens figured here; 

 Golden, Colorado, a more imperfectly preserved one. • 



