knowlton.] TERTIARY PLANTS OF NORTH AMERICA. 171 
Platanus platanoides (Lx.) n. comb. 
Viburnum platanoides Lx. Ann. Rept. U. S. Geol. and Geogr. Surv. Terr., p. 
314, 1874- [1876] ; Tert, Fl., p. 224, pi. xxxviii, f. 8, 9, 1878. 
Laramie group: Black Buttes, Wyoming. 
Platanus primseva Lx.= Platanus latior. 
Platanus primseva grandidentata Lx. = Platanus latior grandidentata. 
Platanus prima3va integrifolia Lx.= Platanus latior integrifolia. 
Platanus primaeva subintegrifolia Lx.= Platanus latior subintegrifolia. 
Platanus Raynoldsii Newby. Later Extinct Floras, p. 09, 1868 ; Lx., 
Tert. Fl., p. 185, pi. xxvi, f. 4, 5; pi. xxvii, f. 1-3, 1878. 
Fort Union group: Montana. 
Upper Laramie group: Canada. 
Denver group: Golden, Colorado. 
Miocene?: ? John Day Valley, Oregon. - 
P'atanus Raynoldsii integrifolia Lx. Tert. FL, p. 185, 1878. 
Platanus integrifolia Lx. MSS. in Lx., Tert. FL, p. 185, 1878. 
Denver group: Golden, Colorado. 
Laramie group: Black Buttes, Wyoming. 
Platanus recurvata Lx. = Sassafras recurvatum. 
Platanus rhomboidea Lx. Ann. Eept. U. S. Geol. and Geogr. Surv. 
Terr., p. 400, 1873 [1874]; Tert. Fl. 186, pi. xxvi, f. 6, 7, 1878. 
Viburnum anceps Lx. Tert. FL, p. 227, pi. xxxviii, f. 11, 1878. 
Denver group: Golden, Colorado. 
Platanus? sp., Dn. Trans. Eoy. Soc. Canada, vol. v, sec. iv, p. 33, 1887. 
[Wood.] 
Belly Kiver series: Bibstone Creek. 
Platanus sp., Cragin. Bull. Washburn College Laboratory, vol. ii, no. 
10, p. 06, 1889. 
Cretaceous: Cimarron Valley, south of Mead County, Kansas. 
Platanus sp., Kn. Bull. Geol. Soc. Am., vol. viii, p. 142, 1897. 
Laramie?: Dutton Creek coal, Wyoming. 
PLATYPTERYGIUM Schimper. In Zittel Handb. Pal., vol. ii, p. 
225, 1880. 
Platypterygium densinerve Font. Potomac Fl., p. 169, pi. xxx, f. 8; 
xxxi, f. 1, 4; xxxii, f. 1, 2; xxxiii, f. 1; xxxiv, f. 1 ; xxxv, f. 1, 2, 1889. 
Potomac formation : Fredericksburg, Virginia. 
Platypterygium Rogersianum Font. Potomac FL, p. 171, pi. xxxi, 
f. 2; xxxiii, f. 2 5 xxxiv, f. 2, 1889. 
Potomac formation : Fredericksburg, Virginia. 
POACITES Brongniart. Prod. Hist. Veg. Foss., p. 137, 1828. 
Poacites laevis Al. Br. In Stizenberger, Uebersicht d. Vers. d. 
Baden, p. 74, 1851; Lx., Ann. Eept. U. S. Geol. and Geogr. Surv. 
Terr., p. 285, 1871 [1872]. 
Green Eiver group: Barrel Springs, Wyoming. 
