14 FLORA OP THE MONTANA FORMATION. 
LiriophyJlum, being in some respects like L. populoides as figured "by 
Hollick; 1 but more careful comparison shows it to be more like the form 
to which it is here referred. 
Habitat. — Right bank of Missouri River, 7 miles beiow the Goal 
Banks. Collected by Lester F. Ward, August 24, 1883. 
Plat anus f Wardii u. sp. 
PL II, figs. 1-4. 
Leaves evidently of firm texture, broadly ovate in general outline, 
slightly three-lobed, truncate or slightly cordate at base, the lobes 
acute, apex not preserved ; margin undulate or obscurely and obtusely 
toothed; petiole very thick and strong; midrib strong, straight; sec- 
ondaries four or five pairs, opposite or subopposite, at an angle of about 
45°, the lowest pair strongest, opposite, arising from the top of the 
petiole, branching outside, entering the lateral lobes; upper secondaries 
simple, or with one or two branches on the lower side, all apparently 
craspedodrome; branches of lower pair of secondaries simple or, rarely, 
once-forked, craspedodrome (f); nervilles strong, percurrent; finer ner- 
vation not retained. 
This form appears to be the most abundant one in the collection, and 
besides the most perfect specimens, which have been figured, there are 
a great number of fragments, but as not one is preserved entire it is 
impossible to be perfectly certain of the outline. In general, however, 
it may be described as broadly ovate, with a truncate or very slightly 
cordate base and a rather abruptly obtuse apex. There appears to be 
small lateral lobes, one on each side, which are entered by the lowest 
secondaries. The margin is not well preserved above the base, but 
appears to be shallow-toothed or undulate. It is probable that it has 
more pronounced teeth in the upper portion. The petiole, as stated in 
the diagnosis, is very thick, but as only about 2 cm. of its length is 
preserved the complete character can not be ascertained. The ner- 
vation is strong and well marked. The lower pair of secondaries 
arise at the very base of the blade, and pass nearly straight to the 
lateral lobes. Below this pair of secondaries, next the lower margin of 
the blade, is a pair of thin nerves, quite as in Populus; they soon 
disappear. 
In size these leaves appear to be from 4 to 11 cm. in width, and from 
5 to 12 cm. in length. 
When this collection was first brought to public attention by Prof. 
Lester F. Ward, 2 he regarded these leaves as "nearly allied to Platanus 
latiloba of Xewberry ( Sassafras mirabile Lesqx.) and perhaps connecting 
this with Platanus nobilis Newb." An examination of these species 
shows a decided resemblance, yet there are, on close inspection, impor- 
tant points of difference. Take first the case of P. latiloba. As 
' Bull. Torr. Bot. Club, Vol. XXI, PL CCXXI. 
'Am. Jour. Sci., 3d ser., Vol. XXVII, pp. 292-303 (1884). 
