294 THE AMERICAN MIDLAND NATURALIST 
found as was the case with Nuphar, giving rise thus to a new 
response to a new environment in the last named plant. 
NUPHAR ADVENA. 
Two distinct species of Yellow Pondlilies were found in 
Bankson and North Bankson Lakes. Both are abundant in 
sheltered muddy parts of the lakes called ‘‘coves.’”’ So readily 
were they distinguished at sight that my attention to the main 
differences was first called by a companion who had never studied 
botany. Nuphar advena grows nearer to shore as a rule but even 
in very deep location lifts its leaves entirely out of water. 
Nuphar variegata grows nearly always in deep places and the 
leaves always float. The petioles of the former are stout oval 
or almost orbicular in cross section and the basal sinus is open with 
wide spreading lobes. The lobes. of the later are closed and the 
semicircular outline of petiole cross section shows two noticeable 
projections representing wings. 
Fernald and St. John' consider Standley’s estimate as to 
the size of the ‘‘floating leaves usually 17-28 cm. long and 11-22 
em. wide” ‘‘as unfortunate’’ or apparently extravagant. From 
herbarium specimens it is not always safe to conclude as to leaf- 
size, even if such a character means very much in some plants. 
There is a decided tendency not to collect the older and the largest 
leaves of plants, because they are in case of water plants especially, 
inconvenient to mount, or defective or broken by wind and eaten 
by insects. My herbarium specimens of these plants were very 
carefully made in the last few years, yet not with the idea of ob- 
taining the largest sizes, though the largest young and perfect 
ones. Average sizes were obtained and their length is from 15-30 
em., and they are proportionately wide. I have seen numerous 
plants with older but torn leaves that were no less than 35 cm. 
long! 
The rhizomes of both species of Nuphar can not be distin- 
guished. ‘The specimens of skins of those of N. variegata show 
perhaps closer arrangement of leaf insertions in phyllotaxy, and 
are found deeper in the mud, the roots usually arising only from 
the lower side in both. I have been unable to find aquatic fohage 
in blooming plants late in season, though in vegetative specimens 
of N. variegata such was occasionally met with. The flowers of 
* Rhodora 16: 138 (1914) 
