CRETACEOUS FLORA. 13 



Popiilites, Alnites.] 



crenata Heer. in Fl. Tert. Helv.. PI. LXH, f. 6, being only smaller and narrower. It 

 differs much, however, by its coriaceous texture, the secondaries equidistant, straight, 

 and ending into the borders; their divergence being only 25. The nervilles, at right 

 angles to the veins, are flexuous, generally simple and percurrent. The leaf is also 

 comparable to P. gaudini Heer, 1. c., PI. LXIV, f. 2. 



Hob. North side of Big Cotton wood river, near New Ulm, Minnesota. 

 Mus. Beg. No. 5376. 



POPULUS BERGGRENI Heer. 



PLATE B, PIG. 3. 



Heer^ Arct. Fl. Ill, p. 106, PI. XXIX, f. 1-5; VI. Part 2, p. 63, PI. XVII, f. 8a; PL XVIII, f. l-4a, b, 

 9o, lOa; PI. XIX, f. la; PL XL,f. 7n; PI. XLI, f. 1 ; PL XLV, f. IS. 



Leaves ovate, equally narrowed upward to a blunt apex and downward to the base, 

 decurring into a long petiole destroyed in the leaf; very entire; lateral nerves thin, 

 camptodrome. 



In regard to the shape, the leaf is like that of PI. XXIX, f. 5, /. c., having 

 however, the secondaries less arched, especially similar, for the cuneate base and the 

 straight nervation, to PI. XVIII, f. 3, and for the general form and size, to f. 1, of the 

 same plate. This last has also on one side a marginal nerve following the border 

 upward as high as the nerve above it and parallel to it. The leaf is broken quite near 

 its base, and the petiole destroyed. 1 consider the identification of this leaf as right. 

 It has a distant relation to P. winchelli. 



Hab. North side of the Big Cottonwood river, near New Ulm, Minnesota. 

 JVfus. Reg. No. 5383. 



ALNITES CRASSUS, sp. nov. 



PLATE B, FIG. 4. 



Leaf coriaceous, thick, rough of surface, round-oval, obtuse, obliquely truncate at base, 

 shallowy toothed from below the middle upward; nervation pinnate, strongly marked; 

 lateral nerves thick, open, parallel, alternate, the lower ones much branched; craspedodrome. 



The leaf, which has the facies of an Alnus, is 5| cm. long, 6 cm. broad with a 

 petiole entire or fragmentary(?) 1 cm. long. It is uneqailateral, somewhat inclined 

 to one side, with 6 pairs of secondaries at an angle of divergence of 60 curving 

 upward in traversing the lamina, the lowest joining the nerve at a short distance 

 above the basal borders, much branching on the under side ; the upper either dicho- 

 tomous or branching near the borders, all entering the point of the teeth with their 

 divisions, teeth short at right angles to the borders, separated by shallow sinuses 

 nervilles distinct and percurrent. 



