KNOWLTON. 
TERTIARY PLANTS OF NORTH AMERICA 151 
Nageiopsis microphylla Font. Potomac FL, p. 201, pl.lxxxiv, f. 6; 
Lxxxv, f. 14; lxxxvi, f. 1-3, 5, 1889. 
Potomac formation : Fredericksburg, near Potomac Run, and near 
Dutch Gap Canal, Virginia. 
Nageiopsis obtusifolia Font. Potomac FL, p. 200, pi. lxxxv, f. 7,1889. 
Potomac formation: Near Potomac Run, Virginia. 
Nageiopsis ovata Font. Potomac Fl., p. 199, pi. lxxvii, f. 4; lxxx, f.5, 
1889. 
Potomac formation: Fredericksburg, Virginia. 
Nageiopsis recurvata Font. Potomac Fl., p. 197, pi. lxxv, f. 2; lxxix, 
f. 4; lxxx, f. 3, 1S89. 
Potomac formation : Fredericksburg, and Dutch Gap Canal, Vir- 
ginia. 
Nageiopsis subfalcata Font. Potomac Fl., p. 203, pi. clxviii, f. 4, 1889. 
Potomac formation: Near Dutch Gap Canal, Virginia. 
Nageiopsis zamioides Font. Potomac FL, p. 196, pi. lxxix, f. 1, 3; 
lxxx, f. 1, 2, 4, lxxxi, f. 1-6, 1889. 
Potomac formation: Fredericksburg, and Dutch Gap Canal, Vir- 
ginia. 
NAJADOPSIS Heer. Fl. Tert. Helv., vol. i, p. 104, 1855. 
Najadopsis rugulosa Lx. Cret. and Tert. FL, p. 142, pi. xxiii, f. 7, 
1883. 
Green River group : Florissant, Colorado. 
NEGTJNDOIDES Lesquereux. Am. Journ. Sci., vol. xlvi, p. 101, 1868. 
Negundoides acutifolia Lx. Am. Journ. Sci., vol. xlvi, p. 101, 1868; 
Cret. FL, p. 97, pi. xxi, f. 5, 1878. 
Dakota group : Lancaster, Nebraska. 
NEGUNDO Moench. Mett., p. 334, 1794. 
Negundo triloba Newby. Later Extinct Floras, p. 57, 1868. 
Fort Union group: Fort Union, North Dakota. 
NELUMBIUM Jnssieu. Gen., p. 68, 1789. 
Nelumbium Lakesii Lx. = Nelumbium Lakesianuin. 
Nelumbium Lakesianum Lx. Ann. Rept. U. S. Geol. and Geogr. 
Surv. Terr., p. 403, 1873 [1874]. 
Nelumbium Lakesii Lx. Tert. Fl., p. 252, pi. xlvi, f. 1, 2, 1878. 
Denver group: Golden and Sedalia, Colorado. 
Nelumbium pygmaeum Dn. Trans. Roy. Soc. Canada, vol. viii, sec. 
iv, p. 87, f. (in text) 22, 1890. 
Eocene?: Similkameen River, British Columbia. 
Nelumbium saskatchuense Dn. Trans. Roy. Soc. Canada, vol. v, 
sec. iv, p. 35, 1887 [1888]. 
Belly River series?: Canada [exact location not given], 
Nelumbium tenuifolium Lx. Ann. Rept. U. S. Geol. and Geogr. 
Surv. Terr., p. 402, 1873 [1874] ; Tert. FL, p. 253, pi. xlvi, f. 3, 1878. 
Laramie group : Sand Creek, Colorado. 
Nelumbium sp., James = Cycadeoidea mirabilis. 
