3864 OLDER MESOZOIC FLORAS OF UNITED STATES. 
long. The fruits are elliptical or fusiform, about 8 mm. long and 4 
mm. thick in their thickest portions. They are mostly much distorted 
by pressure, but some show their former and true shape. 
There are several known fossils with which this .may be compared, 
but from which it is almost certainly, at least specifically, different. 
It resembles an aggregation of nut-like fruits that Heer’ ascribes to 
Czekanowskia rigida, for no reason except that it is found on the same 
rock specimen with leaves of that plant. Heer’s plant, however, has , 
smaller nut-like seeds and the pairs are placed much farther apart than 
they are in the plant from the California locality. Heer’s fossil has 
also the axis on which the pedicels are placed much straighter than 
that of the plant now in question. This latter may also be compared 
with Stachyopitys Preslii Schenk, as figured by Schenk in Fossil Flora 
der Grenzschichten, pl. xliv, fig. 12, but the two plants are clearly 
different species, for that of Schenk has smaller ribbed seeds of ovate 
shape. 
Fig. 4 gives a form showing the double nuts, and Fig. 6 represents 
a more complete form of larger size. 
GENERAL REMARKS AND CONCLUSIONS. 
The collection referred to in the preceding pages, that was made by 
Mr. Stanton and referred by Mr. Ward to me for determination, was 
a small and imperfect one. A study of it left me in doubt as to its 
precise age. The conclusion to which I came was expressed in the 
following words, quoted from a report made to Mr. Ward: 
This flora is not older than the uppermost Trias and not younger than the Oolite. 
I feel pretty sure that it is true Rhetic, somewhat younger than the Los Bronces 
flora of Newberry and the Virginia Mesozoic coal flora. It is much like the Rhetic 
flora of France made known by Saporta. It is a new grouping of plants. Ido not 
think the fossils now in hand suffice to fix narrowly the age, which may be lower 
Jurassic. 
The much more complete collection and better-preserved fossils 
obtained by Mr. Ward from the same beds give more satisfactory 
data, although the evidence is not sufficient to fix conclusively within 
narrow limits the age of the formation. The collection made by Mr. 
Ward, although much larger than that made by Mr. Stanton, and con- 
taining better-preserved plants, is still not large enough to be exhaust- 
ive. Correcting the results obtained from the examination of Mr. 
Stanton’s collection by the facts made known by the study of that of 
Mr. Ward, we find 28 distinct forms in the Oroville beds (see table 
below, p. 367). 
1¥Flora Foss, Arct., Vol. IV, Pt. Il, Beitrige zur Jura-Flora Ostsibir. und des Amurlandes, p. 116, 
pl. xxJ, fig. 8a. 
