DESCRirTION OF THE SrECIES. 235 



imprints made by the two medial depressed lines of the leaf; leaves 

 rather remote, flat, coriaceous, and persistent. 



Locality : 72d mile-post, near Brooke ; only one specimen found. 



This plant is quite different from the .species of Cvphalotaxoims and 

 Nageiopsis found in the Potomac flora. The leaves were leathery and 

 durable, and marked by two prominent cord-like ridges in the center, which 

 do not seem to have been nerves. 



TOEREYA FALUATA, Sp. UOV. 

 Plate CXIII, Fig. 4. 



Stems of ultimate twigs slender; leaves coriaceou.s, distichous, ap- 

 proximate, spreading, attached by a broad base to the margins of the twigs, 

 or somewhat within the margins, slightly decurrent, linear, falcate, acute, 

 prolonged at the summit into a short spinous tip. Marked in the medial 

 line with two strong parallel lines. 



Locality : Hill-side near Potomac Run ; rare. 



This plant is a good deal like T. parvifoUa, Heer, as given in Flor. 

 Foss. Arctica, vol. 3, pt. 2, PI. XVII, Figs. 1, 2. 



CEPHALOTAXOPSIS, gen. nov. 



Trees or shrubs, witli fruit probably in tlie form of drupaceous and 

 nut-like seed, branching copiously, with branches umbellately an-anged or 

 alternate in tlie same plane, often opposite from paired terminal buds ; 

 stems comparatively very stout, rigid, and woody ; leaves distichous, vary- 

 ing a good deal in size, flat, linear, thick and leathery, persistent, attached 

 by very short slightly twisted footstalks to the sides of the stems or 

 slightly within the margins, prolonged at the apex into a short spinous 

 tip, with a single flat broad midnerve, which on the lower side of the leaf 

 is bordered on each side like Torreya by a sunken line. 



This is a very important genus in the Potomac flora, on account of 

 both the number of species and the great number of individuals in some of 

 the species. The genus is one of the most characteristic t}-pes of the Poto- 

 mac vegetation. It is very near to Cephalotaxus, but does not appear to be 



