72 FLORA OF THE MONTANA FORMATION. 
Viburnum anomalum n. sp. 
Viburnum rotundifolium Lx, Tert. PL, p. 225, PI. LXL fig. 22 (1878). [Non PL XXXVII, 
fig. 12, and PL XXXVIII, fig. 10.J 
Leaf nearly round in outline, the margin slightly toothed ; midrib 
strong, slightly flexuose; secondaries about five pairs, arising at an 
angle of about 45°, the lower branching on the outside, the branches 
entering the teeth; nervilles strongly marked, percurrest) or often 
broken. 
This leaf is 3.5 cm. in length and 3 cm. in width, being nearly circu- 
lar. The marginal teeth are faint. They are entered by the secondaries 
or their branches. The nervation is strongly marked, and is well shown 
in Lesquereux's figure. 
This species, as shown by the synonomy, was described as Viburnum 
rotundifolium , but even the author was a little in doubt as to its 
belonging with the leaves from Black Buttes. A careful examina- 
tion of all the specimens leads me to the belief that they are not the 
same. The two leaves from Black Buttes are slightly heart shaped 
and decidedly unequal-sided at base, while the leaf from Point of Rocks 
is rounded and equal at base. 
It does not appear that any additional specimens of this form have 
been collected. 
Habitat. — Point of Rocks, Wyoming. 
Viburnum Whymperi Heer. 
PL XVII, fig. 1; PL XVIII, fig. 1; PL XIX, fig. 3. 
Viburnum Whymperi Heer, Fl. Foss. Tert., Vol. II, Abth. 4, p. 475, PL XLVI, fig. lb; 
Lesquereux, Tert. FL, p. 225, PL XXXVIII, fig. 7 (1878). 
It is with some doubt that the specimens here figured are referred to 
Viburnum Whymperi, and by this species is meant the V. Whymperi as 
defined and illustrated by Lesquereux and not the original of Heer. 
It is more than doubtful whether the leaf from Black Buttes referred 
to V. Whymperi by Lesquereux is correct. It is much more likely to 
prove a new species. 
The example from Point of Rocks is twice the size of the Black 
Buttes specimen, and, moreover, differs slightly in nervation ; but rather 
than make a new species on insufficient material, I have decided to keep 
them together, at least for the present. Among the material obtained 
during the season of 1896 in Converse County, Wyoming, froin the 
so-called Ceratops beds, were numerous leaves that are evidently the 
same as the leaf from Black Buttes mentioned above. They are decid- 
edly different from the original species of Heer, and when they come 
to be thoroughly worked up it will probably be found best to separate 
them. 
The leaf shown in fig. 1, PI. XVIII, is slightly anomalous, being more 
