ADDED TO THE FLORA OF THE LARAMIE GROUP. 125 



STERCULIACE.E. 



Sterculia modesta, Sap. 



Plate XX, Fig. 5. 



Leaves thick, rounded in the lower part, trilobate at the apex; medial lobe longer, 

 separated from the lateral by broad sinuses; nervation trifid from the base; lateral 

 nerves camptodrome. 



This finely preserved leaf is 8 centimeters long from the base to the 

 apex of the middle lobe, and 6 centimeters broad between the points of the 

 lateral ones. It is enlarged in the middle, a little contracted below the 

 lateral lobes, and deltoid to the apex. The primary nerves are strong; the 

 lateral are entwined by distinct nervilles; the areolation is in loose irreg- 

 ularly quadrate meshes. 



By comparison with a fragment described under this name in "Fl. de 

 Sezanne," p. 401, pi. xii, fig. 2, the American leaf has been identified by 

 the author. 



Hub. — Golden, Colorado. A. Lakes. Specimen in the Museum of 

 Princeton College. 



FRANGULACEJE. 



Z i z y p h u s Beekwithii, ep. nov. 



Plate XIX, Fig. 5. 



Leaf membranaceous, oval or obovate, rounded at the top, narrowed and decur- 

 rent to the petiole, palmately tri-nerved from the base; medial nerve narrow, with a 

 single branch above the middle, the lateral curving up at a distance from the borders 

 nearly aerodrome, much branched outside; nervilles close, distinct, at right angles to 

 the midrib. 



The fine leaf, somewhat fan-like, 4i centimeters long, 3 broad, has a 

 thick petiole a little more than 1 centimeter long. The lateral primary 

 nerves ascend to the top at equal distances from the midrib and the bor- 

 ders, which are perfectly entire. The secondary nerves are numerous 

 (about 12 pairs), parallel, the lower being basilar and marginal; the ner- 

 villes are strong, parallel, continuous, and very close. The species is 

 related to Zizyphus Baincourti, Sap., of the Sezanne flora. 



Hub. — Near Golden, Colorado. H. C. Beckwith. Specimen in the 

 National Museum. 



