300 UNITED STATES GEOLOGICAL SURVEY— TEllTIARY FLORA. 



rough. The relation of this leaflet to the one described by Hecr as A. rigida 

 (Fl. Tert. Helv., iii, p. 133, pi. cxl, fig. 22) is evident The hard texture of 

 the leaflets and Iheir nervation are the same: they merely differ by the shape. 

 Habitat. — Near Castello's Ranch, Colorado {Dr. F. V. Hiniden). 



MIMOSITES, Ett. 

 ITIimosites liii earif oliiis, Lesqz. 



Plate LIX, Fig. 7. 

 Cwsalpinia linearis?, Lesqs., Anuual Reiiorfc, 1873, p. 417. 



Leaf iniparipinuate ; leaflets opposite, close, small, Tmear, abruptly pointed, falcate upward, 

 rounded at the point of attachment to the narrow common pedicel ; nervation obsolete. 



The fragment, the upper part of a leaf, has seven pairs of leaflets on a 

 length of two and a half centimeters. These leaflets appear of a somewhat 

 thick texture, as every trace of nerve, even of the middle one, is concealed. 

 They are narrow, only two millimeters broad, the lowest one and a lialf 

 millimeters long, nearly linear, oblique, rapidly pointed, and curved upward 

 near the point, sessile by a rounded base. This species is evidently related 

 to the Mimosa: rather than to the Legumlnosa;. It has especially a marked 

 degree of relation to Pitheculohium duke, Mart , a living species of Brazil, 

 wliose leaflets, of the same form and size, scythe-shaped toward the point, 

 have a very thin nervation, and are sessile and rounded to the base. 



Habitat. — Florissant, near South Park, Colorado {Prof. E. D. Cope). 



LEGTJMINOSITES, Brgt. 

 LiC g:uuiin osites cassioides, sp. nov. 



Plate LIX, Figs. 1-4. 



Leaflets oblong, rounded in narrowing to a short petiole, apparently lanceolate to a point ; lateral 

 veins curved, reaching close to the borders ; areolation small, subquadrate from subdivisions of distinct 

 uervilles in right angle to the nerves. 



These leaflets are comparable to those of species of Cassia; for the shape 

 and tiie nervation, especially to C. herenices, Ung. (in Heer's Fl. Tert. Helv., 

 iii, p. 1 18, pi. cxxxvii, figs. 42-56). The nervilles in right angle to the nerves 

 are, however, not distinctly marked in this European Miocene species. Our 

 fig. 3 has the inequilateral form, and the lateral nerves branching as in C. 

 phaseolites, Ung. (in Heer, loc. rAt., p. 119, pi. cxxxviii, fig. 7). The attribu- 

 tion of this last species is doubtful, according to Schimper. 



Habitat. — The three first figures are from specimens from Green Kiver, 

 Wyoming, above fish-bed {Dr.F. V.Hmjdm); the fourth from Spring Canon, 

 near Fort Ellis, Montana {Jos. Savage). 



