222 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



DAPHNOGENE, ITng. (emend.). 



The leaves referred to thi;; geiuis are similar in form to those of the 

 narrow-leaved Cmnamomum. They are described as entire or Irtlobate, tripli- 

 nerved, ivith the lateral nerves sub- or suprahasilor and the branches distant, 

 camptodrome or brachiodrome. 



Dapliiiogene auglica, ? Heer. 

 Plate XXXVII, Fig. 9. 



Daphnogene atrgUca, Heer, Fl. Tert. Helv., iii, p. 315 (note). 



Daphnogene anglica?, Lesqx., Annual Report, 1873, p. 401. " 



Leaf lanceolate-acuaiinate ; lateral veins subbasilar, aerodrome, distant from the borders, and 

 distantly ramose; nervilles close, in right angle to the nerves, distinct. 



Prof. Heer briefl}' describes the leaves of this species, not figured, as 

 ovato-lanceolate, long-acnminate, triple-nerved; middle nerve and secondary 

 ones branching. Our leaf is only lanceolate; the midrib is not branching, 

 tiiough another fragment has some branches, and even, in the one figured 

 here, some thin branchlets appear, cutting obliquely the nervilles in the 

 upper part of the leaf The evidently aerodrome nervation of the specimen 

 of fig. *J is not seen upon any of the species of Daphnogene described and 

 figured by European authors except in D. Kami, Ilcer (Fl. Foss. Arct., 

 p. 112, pi. xiv, xvi, fig. 1), whose reference to this genus is doubtful. It 

 is therefore probable that, as Saporta supjwses, this leaf may represent a 

 Zizyphus or a Ceanothus; but I do not find in any of these generic divisions 

 a species to which it is seemingly related. 



Habitat. — Golden, Colorado {Copt. Ed. Berthoud). 



GAMOPETALiE 

 LONICEREJE. 



VIBURNUM, Linn. 

 This genus, which counts at our epoch more than fifty species, has its 

 origin marked in the Eocene; at least, no Viburnum leaves have been described 

 until now from the Cretaceous.* The largest number of its living species 

 belongs to Asia, twenty-four; North America has twelve; Japan, five; Europe, 

 only three: a remarkable difference with the Tertiary flora of the same 

 country, from which at least ten species have been described. 



* Count Saporta finds, however, a remarkable aflSLity between a species of the Dakota group, 

 Jmpc'o)i!igUiim allvniiatiim, Lcsfix. (Annual Report, 1874, p. 354, pi. ii, tig. 3), and some leaves, described 

 by himself as nbiirnnm vilifolium, from the Lower Eocene of Gtlindeu. This relation is pointed out in a 

 letter of the celebrated author, his work, a second volume of the Flora of Gelinden, being now in course 

 of publication. 



