FLORA or THE DAKOTA GROUP. i O 



The shape of the leaves is like that of an anchor, except that the 

 medial nerve, or axis, does not pass above the upper border of the leaf, 

 which is cut flat, not, or scarcely, emarginate. 



i/a6.— Elkhorn Creek. Nos. 197, 198, and some fragmentary ones. 



Liriodcndron semi-alatum, Lesqx. 

 "Bull Mu8. Comp. Zool., Cambridge," vol. vii, No. 6, p. 227. 



Leave.s divided at tbe base in two opposite sbort round lobes, obliquely cut in 

 curving up to near the medial nerve and then diverging and enlarging ui)ward into an 

 obovate or spatulate entire lamina. 



This form is somewhat like fig. 7 of pi. vi, Newby., "Illustr.," the lower 

 lobes longer obtuse and more defined, the upper part gradually enlarged, 

 spatulate, obtuse. It may be a distant form of L. Meekii. 



}Iab. — Seven miles from Glasco, Kansas. Specimens Nos. 472, 425. 



Liriodoudrou pinnatifidum, Lesqx. 



ihid., p. a-i?. 



A simple leaf, with the general fades and the nervation of Lirioden- 

 dron, but narrow linear in outline, subalternately trilobed on each side. 

 The top and base of the leaf are broken, the lobes, separated by broad flat 

 sinuses, are half round, entire or irregularly undulate. The fragment is 

 9 centimeters long and 5 broad between the outside curves of the medial 

 lobes, which are a little larger than the upper and lower ones; the lateral 

 veins are close, oblique, parallel, distinct only at and near their point of 

 union to the midrib. The fragment may represent a leaf of a different 

 genus, though its affinity is evidently with Liriodendron. 



Hab.— Two miles from Glasco, Kansas. Specimen No. 531 (526? frag- 

 ment). 



LIRIOPHYLLUM, Lesqx. 



Leaves subcoriaceous, square or broadly rhomboidal in outline, abruptly narrowed 

 to a comparatively sbort petiole, split from the top to the middle along the line of the 

 medial nerve into two primary lobes much enlarged in the lower part, entire or sub- 

 lobate or distinctly bilobate; nervation pinnate. 



By the facies and the nervation these leaves have a great affinity to 

 those of Liriodendron. Instead of being merely emarginate at the top 

 they are deeply cut down, nearly to the middle, in two lobes joined by a 

 narrow more or less obtuse sinus. This is indeed the more marked 

 difference. 



