FLORA OF THE DAKOTA GROUP. 73 



which appear somewhat closer. As the veinn; are very indistinct the refer- 

 ence is somewhat uncertain. 



Hal). — Near Morrison, Colorado. A. Lakes. Specimen Nos. 13 and 

 13a of the Museum Comp. Zool., of Cambridge. 



Magnolia tenuifolia, Lesqx. 



"U. S. Geol. Eep..'' vi, p 9), pi. xxi, fig. 1. 



3Iaguolia obovata, Newby. 



"Later Ext. Fl.," p. 15; "Iliustr.," pi. ii, fig. 2; iv, fig. 4. 



Leaves large, obovate, entire, thick and smooth, pointed and slightly decurrent on 

 the petiole; nervation strong; midrib straight and extending to the summit; lateral 

 nerves pinnate, set at somewhat unequal distances, straight and parallel below, forked 

 and ino.sculating above, forming a festoon parallel with the margin; terminal nerves 

 forming an irregular network of polygonal and relatively large areoles. ( Newby.) 



Hah. — Blackbird Hills, Nebraska. Dr. Hayden. 



Mag-nolia species. 



Plate XI, Fig. 6. 



A flattened immature receptacle or carpile of a Magnolid. The short- 

 pediceled cone is oblong-obtuse, covered with short obtuse carpels. 

 Hah. — Near Morrison, Colorado. //. C. Beckwiih. 



LIRIODENLRON, Linn. 



Liriodendron Meekii, Heer. 

 •• Phyll. Cr^t. du Neb.," p. 21, pi. iv,fig8. 3,4. 



Leaves panduriform, emarginate at the top, bilobate; lolies obtuse; secondary 

 veins branching. (Heer.) 



Hah. — Tekamah, Nebraska. Professor Capellhii. 



Liriodendron primaevum, Ne\^by. 



"Later Ext. Fl.," p. 12; "Iliustr.," pi. vi, figs. 6, 7. 



Leaves three-lobed, upper lobe emarginate, all the lobes rounded; nervation del- 

 icate, medial nerve straight or slightly curved, terminating in the sinus of the superior 

 lobe; secondary nerves gently arching upward, simple or forked near the extremities, 

 a few more delicate ones alternating with the stronger. (Ny.) 



From comparison of specimens received from Greenland, Professor 



Heer considers this species, as also the leaves described as Leguminosifes 



Marcoiiamis, Heer, and PhijlUtes ohcordatus, Heer (Newby., "Iliustr.," pi. 



V, figs. 2, 3), as identical with the preceding species. 



