DESCRIPTION OF SPECIES— GUPDLIFEK.^. 155 



middle, obtusely dentate above, witli mimeroiis parallel, camptodronie, sec- 

 ondary veins, diverging about 40°, slightly more open in tlie lower part of" the 

 leaf. The reference to Quercus Lahnrpi is contradicted by the total absence 

 of nervilles, the more numerous, closer, secondary veins, and the curve of 

 the borders of the leaf to the base, or to the petiole. It resembles some 

 species of Fraxinus, like F. denticulata, Heer (I\rioc. Bait. FL, p. 89, pi. xxiv, 

 figs. 2fi and 27). The absence of the details of nervation |)revents a satis- 

 factory comparison and identification of this leaf". 



Habitat. — Six miles above Spring Canon, Montana {Dr. F. V. Hayden). 



Quercus Ellisiana, Lesqx. 



Plate XX, Figs. 4, 5, 7, 8. 



Quercus EUisiana, Lesqx., Annual Report, 1871, p. 297. 



Leaves broadly ovate or ovate-lanceolate, obtusely pointed, obtusely dentate in the upper part, 

 broadly cuneate to a short petiole ; secondary veins at au open angle of divergence, slightly curving in 

 passing to the borders and entering the teeth. 



All the leaves of this locality are ujion coarse metamorphic sandstone, 

 which the vegetable substance seems to have penetrated, and upon which the 

 outlines and the essential parts of the nervation are preserved as painted in 

 black. For this reason, the original consistence of the leaves is inappreciable. 

 These leaves are numerous, variable in shape, broadly rhomboidal, and entire, 

 or with undulate borders, as in fig. 7 ; or ovate and broadly wedge-form 

 toward the point and the base, and distinctly obtusely dentate in the upper 

 j)art, as in fig. 4; or oval, undulate, or dentate above, as in figs 5 and 8. 

 The nervation is variable in the same degree, the secondary veins being 

 either forking, distant, open (angle of divergence 40° to 50°), as in figs. 4 

 and 7, or more numerous, closer, simple, and more oblique, as in fig. 5. 

 A number of fragmentary specimens unite all these forms in one species by 

 transition between their characters. Their general outline is that of leaves 

 of Alnus, a genus to which they might be referable ; but the narrow lanceo- 

 late leaves, like that of fig. 5, rather resemble Qmicns leaves, at least some 

 of those described as Quercus by European authors. Thus this species is 

 closely allied to Quercus 'pseudo-alnus, Ett. (Foss. Fl. v. Bil., p. ,59, pi. xvii, 

 figs. 3-6), merely differing by the character of the denticulation, which is gen- 

 erally more obtuse in the American form, and does not descend so far down. 



Habitat. — Six miles above Spring Canon, near Fort Ellis, Montana 

 {Dr. F. V. Hayden). 



