198 THE FLORA OF THE DAKOTA GROUP. 



position are comparable to Srkrofium rmnamnmJ Heer (Fl. Foss. Arct., vol. 

 4, pt. 3, PI. I, Fig-s. 2, 2b). 



Habitat: Probably EUswortli County, Kansas. In the Snow collection 

 of the museum of the University of Kansas. 



Order ANONACE^. 

 Tribe XYLOPIE^E. 

 Anona oretacea Lesq. 

 Cret. and Tert. Fl., p. 77. 



Order MAGNOLIACE^. 

 Tribe MAGNOLIE^S. 



Magnolia tenuipolia Lesq. 

 PI. XXIV, Fig. 1. 



Am. Jour. Sci. and Arts (series 2), vol. 46, 1868, p. 100 ; Cret. FL, p. 92, PI. xxi, Fig. 1. 



Leaves large, oblong, entire, narrowed upward to a blunt point (broken), 

 dowuAvard to a thick petiole; median nerve thick; secondaries open, ]jai'allel, 

 alternate, inequidistant, forking at a distance from the borders, with branches 

 anastomosing in bows near to the borders, camptodi-ome ; the lower grad- 

 ually shortei', at right angles to the median nerve and like tertiaries, curv- 

 ing backward. 



The part figured here is a fragment comprising about half of a leaf 

 which originally must have measured at least 20'" in length, and from 8''"' 

 to 9""" in width at the middle. When compared with the leaf in the Cret. 

 Fl. (loc. cit.), it completes the characters of this fine species, as in this last 

 figure the shape of the leaf is clearly seen, while in that figm-ed here the 

 nervation is distinct to the base of the l^af. The midrib is here larger and 

 the secondaries much thicker. But the fragment rejireseuts the under side 

 of a leaf while the other is the impression of the upper surface. There is 

 therefore no real difference in the characters. The angle of divergence of 

 the secondaries is the same in both (50° to 55°). The remains of few ter- 

 tiary intermediate veins, indistinctly seen between the more distaiit second- 

 aries in Cret. Fl., PI. xxi (loc. cit.), are represented on tlie figure of PI. XXIV, 

 Fig. 1, and in both leaves the basilar tertiaries are o]:)Solete and n<» secondary 

 is marked in the space occupied by them towaid the Jjase of tlie leaves. 



