246 DESCRIPTION OF SPECIES. 



Qiiercus Breweri, sp. nov. 



Plate LIV, Figs. 5-9. 



Leaves subcoriaceous, linear-lauceolate or ueaily ovatelauceolate or oblanceolate, 

 acute or acuminate, more or less gradually narrowed to a slender petiole, sharply ser- 

 rate from above the base; medial nerve thin, straight; secondary nerves at an acute 

 angle of divergence, simple, parallel, slightly curving in passing to the borders, cras- 

 pedodrome. 



This species, which has some relation to the preceding and still more 

 to Quercus lonchitis, Ung., has narrow leaves, averaging 1 centimeter in 

 diameter and 7 to 8 centimeters in length; the secondary nerves at an 

 angle of divergence of 40° to 50° are thin, less than 3 millimeters distant, 

 all simple and passing to the borders either straight or with a slight curve. 

 Though figs. 8 and 9 are somewhat different in their outline I consider 

 them as of the same species, for they have the same kind of nervation, 

 their base entire as in fig. 7, which represents leaves either narrowed or 

 rounded to the petiole though evidently of the same species. 



Hah.—iohn Day Valley, Oregon. 



CASTANEA, Tourn. 

 Castanea Ungeri, Heer. 

 Plate LII, Figs. 1, 3-7. 

 Heer, " Fl. Arct.," ii, p. 470, pi. xlv, figs. 1-3 ; xlvi, fig. 8 ; "Fl. Foss. AUisk./' p. 32, pi. vii, figs. 1-3. 



Leaves large, oblong, lanceolate-acuminate, dentate ; secondary nerves close, par- 

 allel, craspedodrojne ; seeds subglobose. 



The leaves which I refer to this species are very variable in size, 8 to 

 16 centimeters long or more, 2 to 8 centimeters broad. The teeth of the 

 borders are short, blunt, distant, and the sinuses repand. The lateral 

 nerves simple, rigid, but slightly curved in traversing the blade, all enter 

 the teeth under an angle of divergence of at least 40° to 55°; the nervilles 

 are close, distinct, simple, rarely forking. The nut is oval, nearly 2 

 centimeters long. 



The figures on pi. vii represent the species of Heer under its divers 

 forms. 



Uab. — Rock Corral, Placer County, and Corral Hollow, California. The 

 leaves are very numerous but badly preserved. 



