68 FLORA OF THE MONTANA FORMATION. 
It is extremely doubtful if this is the true Cornus rhamni/olia. The 
European leaves differ in size, also slightly in nervation, and, more- 
over, it is doubtful if much value should be attached to the identifica- 
tion of specimens so widely separated geographically aud geologically as 
are these. 
Habitat. — Point of Kocks, Wyoming. ? Fir Canyon, near Bozemau, 
Montana. 
Cornus impressa Lx. 
Cornus impressa Lx., Ann. Rept. U. S. Geol. and Geog. Surv. Terr., 1873, pp. 385, 
408 (1874); ibid., 1876, p. 513 (1878); Tert. Fl., p. 243, PI. XLII, fig. 3 (1878). 
Cornus Emmonsii Ward, Syu. Fl. Lar. Gr., p. 553, PI. XLVIII, figs. 2, 3 (1886); Types 
Lar. FL, p. 55, PI. XXVI, figs. 2, 3 (1887). 
Leaves coriaceous, oblong-oval, entire, rounded to a very short, 
scarcely distinct acumen, regularly rounded to a short petiole; nerva- 
tion pinnate, camptodrorae, and aerodrome. 
The original type of this fine species is preserved in the United 
States National Museum (No. 354). It came from Mount Bross, Mid- 
dle Park, Colorado, and is the only example yet obtained from that 
locality. The figure given of it by Lesquereux (loc. cit.) is good, except 
that the lower left-hand side is really preserved, and has a faint 
marginal vein. 
The Cornus Emmonsii of Ward rests upon two specimens, both of 
which are again figured on PL XXVI of his work. The first of these, 
fig. 2, is from North Denver, Colorado, in a ravine in front of 
St. Luke's Hospital, ] and the other, fig. 3, is from one of the upper 
beds at Point of Eocks, Wyoming. At first sight, these two leaves 
appear to differ from the type specimen, but a careful study shows that 
they do not differ from it essentially. The larger one, fig. 3, has the 
two lower pairs of secondaries springing from near the base of the leaf, 
but they arch in the same manner as in the type specimen. In the other 
smaller leaf from Denver, the lower pair of secondaries branch on the 
lower side, forming a series of short bows. Both of these characters 
are observable in living species of Cornus. 
The near affinities of C. impressa are undoubtedly with G. orbifera 
Heer, 2 as Lesquereux long ago pointed out. 
Habitat. — Mount Bross, Middle Park, and North Denver, Colorado. 
Point of Rocks, Wyoming. 
Cornus Studeri? Heer. 
PL XV, fig. 3. 
Cornus Studeri Heer, Lesquereux, Ami. Rept. U. S. Geol. and Geog. Surv. Terr., 1871, 
p. 293 (1872) ; ibid., 1873, pp. 382, 385 (1874) ; ibid., 1876, p. 513 (1878) ; Tert. FL, 
p. 241, PL XLII, figs. 4, 5 (1878); Bull. Mus. Couip. ZooL, Vol. XVI, p. 52 (1888); 
Ward, Syu. Fl. Lar. Gr., p. 553, PL XLVIII, fig. 1; Types Lar. FL, p. 55, 
PL XXVI, fig. 1 (1887). 
1 Wrongly stated by Professor Ward (Types Lar. FL, p. 55) to be from Golden, Colorado. 
2 F1. Tert. Helv., Vol. Ill, PI. CV, fig. 15 (1859). 
