knowlton.] DISCUSSION OP BELLY RIVER FLORA. 15 
figured by Newberry l it is seen to be a larger leaf with large lateral 
lobes. It is prominently three-nerved or tri-palmate, the two laterals 
branching freely on both sides. The margin is also different. 
From P. nobilis it differs still more, being less than half the size of 
tbe ordinary leaves of that species. 
In some respects these leaves approach certain species of Populites, 
as for example P. litigiosus (Heer) Lx., 2 from the Dakota group of 
Kansas. It was about the same size, configuration of base, and margin, 
but differs in shape and strongly in nervation. 
In his account of the plants of the Belly River series Dawson 3 
describes a new species of Populus (P. latidentata) that may be allied 
somewhat to the leaves under consideration. It is not figured, however, 
and is only briefly described. He also speaks of leaves of a Platanus 
that seemed to be close to P. nobilis Newb. 
It seems best, however, to consider the Missouri specimens as new, 
and I have named the species in honor of Professor Ward, the collector. 
Habitat. — Right bank of Missouri River, 7 miles below the Goal Banks. 
Collected by Lester F. Ward, August 24, 1883. 
DISCUSSION OF THE BELLY RIVER FLORA. 
The plants of the Belly River series from the Canadian localities 
^ere submitted to Sir William Dawson for study. 4 Only about twenty 
? orms have been detected, and many of these, as may be seen from 
;he following complete list, are more or less unsatisfactory : 
List of Canadian Belly River plants. 
Pistia corrugata Lx. (leaves). 
Piuus or Abies, type of Pityoxylon (wood). 
Sequoia, type of S. gigantea [now called S. Washington iaua] (wood). 
Sequoia, type of S. sempervirens (wood). 
Sequoia Reichenbaclii? (Gein.) Heer (leaves and branches). 
Thuja, type of T. occidentals (wood). 
Taxites, type of Taxus baccata (wood). 
Ginkgo, type of G. biloba (wood). 
Ginkgo (Salisburia) ? (fruit). 
Lemna scutata Dn. (leaves). 
Populus acerifolia Newb. ? (leaf). 
Populus latidentata Dn. (leaves), 
Populus sp. (wood). 
Betula sp. (wood). 
Ulmus sp. (wood). 
Carya sp. (wood). 
Nelumbo Dawsoni Hollick (Brasenia autiqua Dn.) (leaves). 
Trapa cf. T. borealis Heer (fruit). 
Platanus nobilis Newb. (leaves). 
Platanus? sp. (wood). 
Acer saskatchewense Dn. (leaf). 
« 111. Cret. and Tert. Fl., PI. II, fig. 4. 
*F1. Dak. Gr., p. 46, PI. XLVII, %. 1. 
3 Trans. Roy. Soc. Cauada, Vol. Ill, Sect. IV, p. 16. 
4 Trans. Roy. Soc. Canada, Vol. Ill, Sect. IV, p. 18 (1885) ; ibid. Vol. V, Sect. IV, pp. 32, 33 (1887). 
