DESCRirXION OF SPECIES— JUGLANDEJS. 285 



divergence, are simple or si)aringly branching, connected by very thin distant 

 nervilles in right angle (o the veins. As remarked in Iveporl, 1871 {Joe. cil.), 

 it is (iiflicull 1o d(>ci(le if tiicse leaves represent n Jug/a/is or a llhamnus. 

 I'rof. Ilcer lias, in Arct. Fl., i, p. 123, pi. xlix. fig. 10, a leaf vvliose characters 

 are much like (hose ol' liiis species; the Literal nerves are, liowever, more 

 obliipie to the midrib, all simjjlc, and straight to tlie bonU'rs. It is described 

 as Rhamnus Er'ulani. The author remarks on Ibis leal', Ihat, Itul for the 

 straight secondary nerves, it should be referable to Jugfans. Therefore! tiie 

 curved secondarv nerves of our species relate it to this genus. ]>u( in the 

 leaves which represent it, the lateral veins arc somewhat closer, and ])ass 

 nearer to the I)orders than in any species of Jiighnis, except j.erhaps J. 

 ucuminala, Al. ]>r., which, in I'l. Alas., pi. ix, fig. 1, is represented by Ileer 

 with secondary veins ccpiidistant and reaching nearer to the borders than 

 in any other figure of this species. J. rJianmo/drs is thereibie closely 

 related to ./. acuminata, and, as it bears the same relation to ./. rugu.sa and 

 .7. Leconteana, Lesqx., they all may l)e mere varieties of the ])olymori)l)ous 

 J. acuminata, which has been found in the whole extent of the Miocene of 

 Europe. This species is apparently identical with Cornus acuminata, Newby. 

 Habitat. — Spring Canon, Montana {Dr. F. V. Haydcn). Not rare at 

 ■ IMack Buttcs, Wyoming. Point of Kocks, AVyoming {Vr. F. V. Haydcn). 



J II ^ I a II !« L. <> c o II t i' a II :i , Lesqx. 



riato LIV, I'iss. lU-K!. 



Leaves broadly ovate, grailually acuminate, narrowed aud rounded to a sliort jiitinle; Iiorders 

 iindnlute; uervatioii coarse, thick ; lateral nerves on an acute angle of divergence, sligLtly curved in 

 IiUNsiug to tbe borders. 



This species or form was merely mentioned in Annual Report, 18GD, 

 p. 197, and I was a long time in doubt if it could really be separated from 

 the following. From it and irom all the figures which represent .7. acu- 

 minata, it difiers by comparatively shorter and broader leaves, which are 

 first rounded and then abruptly curved or narrowed to the short petiole; 

 \)\ the lateral nerves on a more acute angle of divergence, 40°, i)assing 

 nearly straight toward the borders, with their simple bows nearer to them, 

 a nervation resembling that of Rhamnus still moie distinctly than that oi" 

 the former species. There are no intermediate tertiary veins; the fibrilhe, 

 at right angle to the nerves and obliciuely branched, com])ose an irregularly 

 quadrate or polygonal areolation. 



IIakitat. — Marshall's Mine, Colorado, the fiagnients represented in figs. 



