ON TRAPA NATANS. 245 
from aspecimen in the Herbarium of the Royal Academ of Stock. 
holm, collected last century in the north of Smoland by Liljeblad, 
the young fruits of the variety glaberrima are nearly free (fig. 6), 
=i — in —_— respect with those of the Scanian form. Therefore 
“But t e form now living here is not, so far as its fruit goes, the 
same as that the fruit of which has been found by Mr. Nathorst in a 
half- fossil state in a turf at Nasbyholm in Scania. This fruit (fig. 3) 
-in every respect agrees with the fruit of the Continental form, and 
‘thief is also the case with the ere of the half-fossil form from Den- 
mark, according to specimens which Prof. Steenstrup has been so kind 
as to lend me, and as 8 ths figure given rd ostrup (/.¢.). 
And finally the half. fos fruits of the same plant, found in the Swiss 
pile-buildings, according to oe = by ats r (l.¢. ) “as agree with 
the half-fossil fruits from Scania and Denm 
It results from these inset that the hom of Trapa natans, Z., 
which is now living in Scania nearly y agrees, as to its leaves and flowers, 
with the form which grew in the last century in Smoland, though the 
a by which it ts distinguished from the typical form which is 
Sound on the went are unessential, and somewhat changeable. With 
hinge to ats fruit the Scanian form probably agrees with that from 
Smoland, but is very distinct from the Continental form, which on the 
cally modified. The former of these organs is not sp well de- 
fined, often oblique, or nearly deformed (comp. the figs. 7a, 8, 9). It 
almost seems as if the plant wanted sufficient vital power to cause 
