204 THE FLORA. OF THE DAKOTA GROUP. 



The leaves vary in size from 3.5*"" to G"" long, and from 2^°' to 5'^°' 

 broad at the middle, being either cuneifonn or rounded, or even subtnin- 

 cate or snbcordate at the base. The secondaries, mostly simjjle, pass 

 obliquely, either straight or a little curved, toward tlie borders, A\here they 

 become effaced or a little cur\ed up, seemingl}^ caniptodrome, while a few 

 appear to run directly to the borders as craspedodrome. 



Leaves of this kind have been found abundantly in the Cretaceous of 

 Greenland and described and figured by Heer as quoted above; some also, 

 Init fewer, in the Dakota Group of Kansas, Nebraska, etc. In all these 

 leaves there is no distinct contraction or division of the lamina in three 

 lobes as in the following species. 



Habitat: Pipe Creek, Cloud County, Kansas. No. 4090 (PI. XXVI, 

 Fig. 1) of the collection of Mr. R. D. Lacoe. Fig. 3 is copied from Heer, 

 Fl. Foss. Arct. (loc. cit.) ; Fig. 2 is copied from Newberry (loc. cit). 



LiRIODENDRON SEMIALATUM Lesq. 



PI. XXV, Figs. 2-4; PI. XXIX, Fig. 3. 



Leaves deltoid in outline, truncate-rounded or broadly cuneate at base, 

 enlarged, round-lobed on each side in the lower part, ovate, obtuse or 

 obtusely pointed at apex; median nerve straight; secondaries parallel, 

 numerous, the lowei- pairs in tlie lobes craspedodrome, the ujjper su))camp- 

 todrome. 



The leaves are of medium size, l""" to 9™' long, but the round upper 

 j)art of one seen on PI. XXV, Fig. 4, ai)parently belongs to a much larger 

 leaf They are enlarged in the lower })art into two oj)posite round lobes, 

 abruptly roimding or cuneiform to the petiole, contracted above the lobe in 

 more or less definite sinuses, then slightly enlarged ujjward and ovate or 

 oblong rounded to an ol)tuse or obtusely pointed apex. 



This species differs essentially from L. primcevnm and the other sjjecies 

 of the genus by the entire, not emarginate apex, the leaves being thus 

 merely once lobed on each side of the enlarged base instead oi bilol)ate at 

 the apex, and also by the numerous proximate secondaries, simple or fork- 

 ing near their extremities. The fragment (PI. XVI, Fig. 4) may represent a 

 different species. It has the secondaries more distant, more curved iii pass- 

 ing toward the borders, and more distinctly camptodi'ome.' 



'Prof. Lesquereux has left a very brief note relating to this species, in which ho compares it to 

 L. Procacdnii Ung. (Saporta and Marion, Fl. de Meximieux, PI. xxxni, Figs. 3-5). He then adds that 

 "if these are same as L. inlandinmn, some of my species slionid l>o aliaiidoned." Aa ho has given no 

 further indic.itinu of his wislies I have preferred to retain everything as he left it.— F. H. K. 



