178 CATALOGUE OF THE CRETACEOUS AND [bull. 152. 
Populus latior cordifolia Heer. Fl. Tert. Helv., vol. ii, p. 12, pi. lv, 
1856- Lx., Ann. Rept. U. S. Geol. and Geogr. Surv. Terr., p. 289, 1871 
[1872]. 
Populus latior transversa Heer. Lesquereux, Ann. Rept. U. S. Geol. and 
Geogr. Surv. Terr., p. 287, 1871 [1872]. 
Laramie group?: Medicine Bow, Wyoming. 
Populus latior transversa Heer. = Populus latior cordifolia. 
Populus latior truncata Al. Br. In Stizeuberger, Uebers., p. 79,1851; 
Lx., Oret. and Tert. Fl., p. 226, pi. xlvi, f. 14, 1883. 
Fort Union group: Bad Lands, Dakota. 
Populus leucophylla Ung. Gen. et Sp. PI. Foss., p. 417, 1850; Heer, 
Fl. Foss. Alask., p. 26. pi. iii, f. 4, 5, 1869. 
Eocene: Alaska? 
Populus Lindgreni Kn. Eighteenth Ann. Kept. U. S. Geol. Surv., 
pt. iii, p. 725, pi. c. f. 3, 1898. 
Payette formation : Marsh, Idaho. 
Populus litigiosa Heer = Populites litigiosus. 
Populus longior Dn. Trans. Roy. Soc. Canada, vol. i. sec. iv, p. 27, 
1882 [1883 j. 
Upper Cretaceous : Nanaiino ; Baynes Sound. 
Populus Leuce (Rossm.) Ung. Gen. et Sp. PI. Foss., p. 417, 1850; 
Heer, Proc. Acad. Nat. Sci. Phila., vol. x,p. 265, 1858. 
Dakota group : Kansas ? 
Populus leucophylla Ung. Gen. et. Sp. PI. Foss., p. 417, 1850; Lx., 
Ann. Rept. U. S. Geol. and Geogr. Surv. Terr., p. 296, 1871 [1872]'. 
[Not afterward recognized by Lesquereux.] 
Laramie group?: Spring Canyon, Montana. 
Populus Meedsii Kn. Proc. U. S. Nat. Mus., vol. xvi, p. 34 ; pi. i, f. 
1. 2, 1893. 
Fort Union group: Glendive?, Montana. 
Populus melanaria Heer. Lx. = Populus melanarioides. 
Populus melanarioides Lx. Bull. U. S. Geol. and Geogr. Surv. 
Terr., vol. i, p. 379, 1875 [1876]; Ann. Rept. U. S. Geol. and Geogr. 
Surv. Terr., p. 302, 1874 [1876]; Tert. Fl., p. 174, pi. lxii, f. 5, 1878. 
Populus melanaria Heer Lx. Ann. Rept., op. cit., p. 302, 1874 [1876] ; Tert. 
Fl. p. 173, pi. lxiv, f. 5, 1878. 
Montana formation : Point of Rocks, Wyoming. 
Populus microphylla Newby. Later Extinct Floras, p. 17, 1868. 
Dakota group : Blackbird Hill, Nebraska. > 
Populus monodon Lx. Trans. Am. Phil. Soc, vol. xiii, p. 413, pi. xv, 
f. 1,2, 1869. 
Eolignitic: Mississippi. 
Populus monodon Lx. [Tert. FL, pi. xxiv, f. l,2]=Populus mutabilis 
ovalis and Ficus uncata. 
