DESCRIPTION OF SrECIES— LEGUMINOS^. 299 



shorter tertiary veins anastomosed by nervilles in right angle. This nervation 

 is typically identical with that of P. Knorrii, Heer (Fl. Tcrt. Helv., iii, p. 

 114, pi. cxxxiv, figs. 22-2G; cxxxv; cxxxvi, figs. 1-9); the leaflets of our 

 pi. lix, fig. f), and pi. Ixiii, fig. 2, corresponding to fig. 4, pi. cxxxvi, and tliat 

 of our pi. Ixv, fig. 5, to fig. 3 of tlie same plate of llecr. The shape of tlie 

 leaflets and their size, though comparahlc also to those of F. Knorrii, 

 differ by the longer, sharply pointed acumen, and by the longer slender petiole 

 not inflated at its point of union to tlie middle nerve. The fragment of cap- 

 sule, described in Annual Report, 1873, p. 417, as referable to a Podogonium 

 species, is pedicellate, apparently oval, but l)roUen below the middle, and 

 cannot be specifically identified. It may represent the same species. 



Habitat.— The first of the specimens is from Black Buttes, Wyoming; 

 fhc second (pi. Ixiii), from Middle Park, Colorado {Dr. F. V. Haydm), 



with the broken capsule; the third (pk Ixv), from near the mouth of White 



River, Green River group, Wyoming {Frof. W. Denton). 



CASSIA, Linn. 

 Cassia c o n c i n II a ? , Heer. 



Plate LIX, Figs. 8, 8 o (enlarged). 

 Cas>ia concinna, Heer, Fl. Tort. Helv., iii, p. 122, pi. cx^cxviii, fig. 41.-Lesqx., Aunual Report, 1872, p. 402. 



This fragment of an unfolding leaflet is like the undeveloped ones 

 figured by Heer, loc. cit.; the middle or dorsal nerve is thick and the lamina 

 folded along the lateral nerves. As we have a single leaflet for comparison, 

 this similarity is not sufficient for identification. 



Habitat.— Evanston, Wyoming. 



ACACIA, Neck. 

 Acacia scpteni, rionalis, Lesqx. 



Plato LIX, Figs. 9, 9rt (enlarged). 



Acacia septentrionalis, Lesqx., Annual Keport, 1873, p. 418. 



Leaflet small, coriaceous, oblanceolate, rounded to a very short point, gradually tapering down- 

 ward to the short petiole ; nervation pinnate, aerodrome. 



This small leaflet, two and a half centimeters long, and fbur millimeters 

 broad toward the rounded point, has the lateral nerves alternate, ascending 

 nearly parallel to the midrib, the upper one reaching the point in an inside 

 curve, all anastomosing in oblique veiulets, composing long erpiilateral meshes; 

 these veins are very thin, discernible only with a strong glass; the surface is 



