684 



THE AMERICAN NATURALIST. [Vol. XXXVII. 



the outside which run to the teeth of the margin ; angle of 

 divergence acute, about 30 ; a considerable interval to the next 

 pair of secondaries which leave the midrib at an angle of about 

 40 and ascend in a slight curve to the margin ; the three or 

 four succeeding secondaries on each side become more and 

 more ascending and are unbranched ; margin for the basal 

 third entire, upper two-thirds shallow-toothed ; nervilles per- 

 current at right angles to the secondaries ; midrib thin and 

 straight. I have tentatively included under this species a leaf 

 from the Montana formation which Knowlton (loc. cit.) doubt- 

 fully refers to Viburnum whymperi Heer, a Tertiary species 

 from which it manifestly differs. It differs from our type in 

 the lower secondaries being sub-opposite and supra-basilar, 

 otherwise it is markedly similar. The genus Viburnum has 

 been heretofore unrepresented in the flora of the ancient Atlan- 

 tic coastal plain, the species Viburnum integrifolia referred by 

 Newberry to this genus being an entirely different leaf. Three 

 species occur in the Patoot beds of Greenland and abundant 

 remains are found in the western interior from the Dakota 

 group upward. Among the twelve species and varieties from 

 the Dakota group only one, Viburnum sphenopJiylhtm K11. 

 resembles the Matawan leaf. From this species ours differs in 

 its larger size, more ovate outline, lesser number of secondaries, 

 which are also more ascending and slightly more curved; the 

 margin is less prominently dentate and the basal third is entire; 

 a pair of secondaries leaves the base at an acute angle ; these 

 are wanting in sphenophyllum where all the secondaries are 

 parallel, the first pair leaving the midrib 3 mm. above its base 



