184 DESCRIPTION OF SPECIES. 



ually and longer acuminate ; the border teeth are larger and more acute. 

 The details of nervation are obsolete. 



Hob.— Randolph Co., Wyoming. U. S. Geol. Expl. Dr. F. V. Hat/den. 



CELASTRUS, Linn. 

 "U. S. Geol. Rep.," vii, p. 268. 



Celastrus Lacoei, sp. nov. 



Leaves subcoriaceous, obovate or spatulate, rounded and dentate at the apex. 



The leaf is remarkably similar in character to those described by Heer 

 as C. cassinefolius, Ung., in "Fl. Tert. Helv.," iii, p. 67, pi. cxxi, figs. 24-26, 

 whose leaves are longer and narrower, obtusely dentate or rather crenu- 

 late from the middle upward. 



Hah. — Florissant. Lacoe Collection, No. 49. 



Calastrus Greitliianus, Heer. 

 "Fl. Tert. Helv.," iii, p. 70, pi. cxxi, fig. 63. 



Leaves small, broadly oval, obtuse, very entire, abruptly narrowed to the petiole; 

 lateral nerves nearly at rigbt angles to the midrib, camptodrome. 



Two leaves from Florissant are referred to this species. One is of 

 the same size, form, and nervation as that figured by Heer, the other is 

 more gradually narrowed to the base, lacerated at the rounded apex. This 

 last leaf is more like C. Bruckmanni, Heer, I. c, fig. 32. 



Hub. — Florissant. Lacoe Collection, No. 74. 



Celastrus fraxinifolius, sp. nov. 

 Plate XXXIII, Figs. 2-4 ; Plate XL, Fig. 10. 



Leaves membranaceous, narrowly elliptical in the middle, lanceolate, acuminate, 

 blunt at the apex, narrowed and decurrent to the petiole, crenulate-dentate; secondary 

 nerves at an acute angle of divergence, curving to the borders and reticulate along 

 them. 



The leaves, 5 to 7 centimeters long, averaging 2 centimeters in width 

 in the middle, are mostly equilateral at the narrowly cuneate base, short- 

 petioled, the petiole h centimeter long, being bordered by the decurrent 

 base of the leaves; the lateral nerves unequally distant, much and 

 unequally curved in traversing the lamina, follow the borders in multiple 

 reticulations without entering the teeth, which are distant, obtuse, some- 

 times obsolete. 



