ON TRAPA NATANS. 243 
a variety, and named glaberrima. According ‘to this author it 
differed from the typical form by greater pecan: by the nearly 
glabrous leaves, petioles, and sepals, by the very small swellings of 
the petioles and peduncles, and by the nearly sessile fruit. Moreover, 
judge from the specimens in the Herbarium of the University of 
Upsala and the Royal Academy of Sciences of Stockholm, theflowers also 
appear to be smaller, and the sie aves for the most part to have a form 
differing from the typical one, in being more gradually narrowed 
to their base, and in which their greatest breadth coincides with the 
ieve I can assert decidedly that this mpeaiodin is not from Sweden. 
It ec a more southern character even than specimens from the north 
of Germany, and resembles very much the form of Zrapa natans 
which grows in the west of Fran 
The characters of Wahlenberg’s variety seem very inconstant, and 
this is also the case with the form of the leaves. There is, to be sure, 
a very great difference between this form and that from the south of 
Europe, the latter being characterised by shorter, larger, and more 
swollen petioles, much greater size, and more dense hairiness, larger 
flowers, and by the form of the lamina, which has a nearly truncate 
base, and is almost mat ipa its greatest breadth being nearer to 
the base. But towards the north and east this form graduates into 
the above-mentioned vari ay withot at, however, even in the north 
of Germany becoming quite identical with it. The lamina, even if 
ur. sl 
and East Prussia. With respect to the length of the peduncles 
there seems fe be very little difference between the Swedish and 
Continental for 
The form of ‘Trapa BORG L., which was found in Lake 
Immeln, Scania, in the summer of 1871, agrees very well with — 
Wahlenberg’s variety. It hay the form of leaf characteristic of this 
inconstant than the variety glaberr The leaves are very seldom 
quite Bren the petioles often . pets hairy, which may 
also be the case wih the whole lea “ kar es its hairiness is as 
dense even as on the South E other respects, as, 
for instance, tenderness, length of the coaties ais Acie small swellings, 
smoothness of the sepals, and bog flowers, the form from Scania 
agrees with the variety stan 
€ point, however, ohial duineerhos the Scanian form from 
tha owing on the European continent, and which possesses a 
