298 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



number of tli<' divisions decreasing toward tlin point vvlioro the nerves have 

 f-till one or two l)ranciies, as in tlie living C. jyyracantha., crus-galli, Jlava, 

 etc. The areolation is not discernible. Though the simple nervilles are not 

 a character of this genus, nor the obtuse equal teeth, these leaves have an 

 evident relation to C. antigua, Heer (Fl. Arct,, i, p. 125, pi. 1, figs. 1, 2), 

 two leaves which have, like our fragments, the lower lateral nerves with 

 many branches, the upper being less divided, and only toward the borders; 

 all joined in right angle by strong, distant, simple fibrillse. The Greenland 

 leaves dilfer much, however, by straight, more oblique, lateral nerves and 

 the acute teeth of the borders. 



Habitat. — Carbon, Wyoming. 



LEGUMINOS^. 



Of this class of plants, we have also in the Lignitic flora very few rep- 

 resentatives, though the North American Hora of the present time has a 

 large number of its species. More than three hundred fossil ones are 

 described from the Tertiary of Europe; most of them from the Miocene 

 of Oeningen; a few from the Armissan of France. Five only, of doubtful 

 attribution, are referred to the Eocene of Mount Bolca and of Alum Bay. 



PODOGONIUM, Heer. 



This genus is established by the author from a large number of speci- 

 mens, especially found in the upper strata of Oeningen, and is beautifully 

 illustrated by leaves and fruits in his Fl, Tert. Hclv. With the leaves de- 

 scribed under this generic name, I have found only a fragment of a capsule, 

 which is probably referable to it. 



Podogonium Ainericanuiii, sp. nov. 



Plate LIX, Fig. 5; Plato LXIII, fig. S^; Pl.-ito LXV, fig. 6. 



Podogoniiim species, Lcstjx., Annual Eeport, 1.S73, p. 417. 



Leaves small, lanceolate, acuminato, narrowed to the short petiole; lateral nerves nunioioDS, 

 parallel. 



These leaflets are all of the same form and size, four centimeters long, 

 a little more than one centimeter broad in the middle, narrowed in the same 

 degree upward to a sharply pointed, comparatively long, acumen, and down- 

 ward to a short l)ut distinct petiole. The lateral nerves are close, fourteen to 

 seventeen pairs, diverging in an angle of 40°, either simple or intermi.xcd, with 



