knowlton.] TERTIARY PLANTS OF NORTH AMERICA. 100 
Potentilla canadensis L.=Potentilla anseriim. 
Potentilla norvegica L.=Potentilla anserina. 
Potentilla simplex? Mx.= Potentilla anserina. 
PREISSITES Knowlton. Bull. Torr. Bot. Club, vol. xxi, p. 458, 1891. 
Preissites Wardii Kn. Bull. Torr. Bot. Club, vol. xxi, no. 10, p. 458, 
pi. ccxix, 1894. 
Fort Union group: Burns's Ranch, 30 miles below Glendive, Mon- 
tana. 
Prinos integrifolia Ell. Lx.= Ilex integrifolia. 
PROTEiEPITZLLUM Fontaine. Potomac Fl., p. 281, 1889. 
Proteaephyllum dentatum Font. Potomac FL, p. 286, pi. clvi, f. 7; 
clxxii, f. I, 4; elxxiii, f. 12, 14, 1889. 
Potomac formation: Baltimore, Maryland. 
Proteaephyllum ellipticum Font. Potomac Fl., p. 285, pi. cxlii, f. 1, 
2, 1889. 
Potomac formation: Fredericksburg, Virginia. 
Proteaephyllum oblongifolium Font. Potomac Fl., p. 284, pi. cxxxix, 
f. 5; cxl, f. 1, 2, 1889. 
Potomac formation : Fredericksburg, Virginia. 
Proteaephyllum orbiculare Font. Potomac FL, p. 283, pi. cxxxix, 
f. 4, 1889. 
Potomac formation : Fredericksburg, Virginia. 
Proteaephyllum ovatum Font. Potomac FL, p. 285, pi. cxli, f. 1. 1889. 
Potomac formation : Fredericksburg, Virginia. 
Proteaephyllum reniforme Font. Potomac FL, p. 282, pi. cxxxix, 
f. 3 5 clvi, f. 4 5 clx, f. 1, 2, 1889. 
Potomac formation: Fredericksburg, near Dutch Gap Canal, 
Virginia. 
Proteaephyllum tenuinerve Font. Potomac FL, p. 286, pi. el, f. 13; 
clvi, f. 2, 1889. 
Potomac formation : Near Dutch Gap Canal, near Potomac Run, 
Virginia. 
Proteaephyllum sp., Font. Potomac FL, p. 284, pi. cxxxix, f. 2, 1889. 
Potomac formation : Near Dutch Gap Canal, Virginia. 
PROTEOIDES Heer. Phyll. Cret. d. Nebr., p. 17, 1866. 
Proteoides acuta Heer. Phyll. Cret. d. Nebr., p. 17, pi. iv, f. 7, 8, 1866; 
Lx., Trans Am. Phil. Soc, vol. xiii, p. 431, pi. xxiii, f. 5-7, 1869. 
Dakota group : Kansas and Nebraska. 
Proteoides daphnogenoides Heer. Phyll. Cret. d. Nebr., p. 17, pi. iv, 
f. 9, 10, 1866; Newby., Fl. Amboy Clays, p. 72, pi. xvii, f. 8, 9; xxxii, f. 
11, 13, 14; xxxiii, f. 3; xli, f. 15, 1895 [1896]. 
Dakota group: Decatur, Nebraska. 
Amboy clay: New Jersey; Staten Island; Sea Cliff, Long Island. 
Mill Creek series: Mill Creek. 
