22 AMERICAN MIDLAND NATURALIST 
It is easily distinguished from P. coccinea which blooms only in 
the terrestrial phase. ‘The terrestrial phase growing in great abun- 
dance on the shore never produces flowers in P. grandifolia. The 
spike too is usually longer than that of any amphibious Persi- 
caria known to me. I have found one spike nearly to cm. long! 
The peduncle is usually brownish hirtellous but often with short 
spreading purple rough glandular hairs. 
I have found both phases of this plant in great abundance in 
a muddy pond near Bankson Lake, Mich. where it is associated 
with P. flwitans, but not growing so far from the shore as the latter. 
It is not found in Bankson Lake proper as P. fluitans is, as it does 
not seen to thrive in the sand where waves usually disturb the 
equilibrium of the emerged tops. The plant is more abundant 
among long high sedges and grasses which partially help in keeping 
it erect. I found it in open water only in such parts of the pond 
as were protected by a high hilly bank from the prevailing wind 
of the locality. 
The plants were collected by me in both phases at the afore- 
mentioned place on July 13, 1909, and the specimens are No. 
265a and 265b, of my herbarium. 
I have compared all the plants described above sath the 
types in Dr. Greene’s herbarium in Washington, or those in the 
U. S. National Herbarium. What is considered as sufficiently 
typical P. Hartwright is in the U.S. Dept. of Agriculture Herbarium 
collected by Mr. S. Hart Wright himself at Penn Yan, N. Y. and 
with which I compared my specimens of that plant. 
I can not pass by this enumeration and study of our local 
amphibious Persicarias without referring to a plant of the group 
whose aquatic and terrestrial forms I found near Portland, Oregon 
in Aug. 1908, and 1909, because the case may be illustrative of 
conditions found in certain localities of our region. The plants 
were collected in two places though in each case subject to the 
same habitat and conditions. One of these was found along the 
Willamette River near St. Johns, Ore., the other on the shore of 
a backwater or slough called Mox’s Bottoms in front of Columbia 
University, near Portland, Oregon. During the last summer 
while doing some research in the U. S. National Museum, I compared 
the specimens carefully with Dr. Greene’s type plants, and found 
them to be Persicaria oregana Greene. ‘The plants are Nos. 264 
and 266 of my herbarium. 
