:>4- Lat< r "Extinct Floras of North America, 



Vib 11 rn ii in nspenuii (n. sp.) 



Leaves ovate in outline, rounded or slightly cordate at base, 

 acute and long-pointed above, margins all cut by relatively large 

 acute teeth; nervation strong, crowded; midrib straight; lateral 

 nerves alternate, about nine on each side, the lowest and strongest 

 bearing each 5-6 simple branches on the lower side; the lateral 

 nerves of the middle of the leaf carrying 1-2 branches at the sura- 

 . nuts, t lie upper ones simple, all terminating in the marginal teeth; 

 tertiary nerve^ numerous, connecting the secondaries nearly at right 

 angles, and generally parallel. 



The nervation of these leaves is strong, regular and crowded. 

 The marginal serration is simple, coarse and sharp, much like 

 that of the leaves of many species of Viburnum. 



Formation mid Locality. Miocene strata. Fort Union, 

 t)acotah. (Dr. Ilayden.) 



Viburnum lanceolatmii (n. sp.) 



Leaves small, narrow, ovate or ovatcdanceolate, rounded or 

 slightly wedge-shaped at the base, pointed above, coarsely and 

 Bharply serrate-dentate throughout; nervation strong; midrib 

 straight; lateral nerves about "> pairs, diverging from the midrib at 

 an angle varying from 15° to 20°, all slightly and uniformly arc-lied 

 upward, the basilar pair each throwing out at an acute angle about 

 >i\ simple branches which terminate in the teeth of the margin, 

 tie upper branches supporting each one or two similar branches 

 near the summits; tertiary nervation line, and ^distinguishable in 

 tin- fossil state. 



In tin.- regularity ami precision of the nervation, these haves 

 resemble those of Carpvnus^ bul in mosl species of that genus 

 the -nation of the margins is double, while here it is single, 

 ami, except iii one or two old world forms, the nervation of 

 tin- loaves of the living species of that genus is considerably 

 different, the. basilar pair of lateral nerves being much shorter, 

 and Bimple or less branched. 



The style of nervation observable in these fossils occurs in 

 one or two species of Rhamnus, bul is there very exceptional, 



