OUR AMPHIBIOUS PERSICARIAS 225 
PERISCARIA GRANDIFOLIA. Greene (1904) Leaflets, Vol. I, 
P. 37,49. 
The following plants in the U.S. National Museum may be 
referred to this species. 
649547. E. A: Mearns, Ft. Snelling, Minn. VII, 24, 1888. 
(Duplicates in New York Botanical Garden Herbarium.) 
670719 E. Mearns Camp Douglas, (Probably P. grandfolia?) 
444734 Mosely. Willows Pt. Sandusky, O. VIII, 17, 1895. 
649546 Edgar Mearns, Fort Snelling, Minn,. VII, 24, 1888. 
E. P. Sheldon’s Mira, Kanabec Co, Minn., VII, 1892. 
I have since found the plant growing at the edge of a pond, 
South of South Bend, and west, of Studebaker’s woods, together 
with a new species to be described. The plant is represented 
by numbers 942x and 942y collected July, 12, 1911. Some of 
the leaves are typically aquatic below. 
PERSICARIA RIGIDULA (Sheldon) Greene, (1904) Leaflets 
Wolwkeop. 24. and 309. 
The plant is closely allied to P. grandifolia, and had the same 
habit of growth, nsing rigidly and assurgently from aquatic 
branches. Hitherto it has been known as an aquatic only. Dr. 
J. Iunell has sent me a specimen with explicit notes, one sheet 
of which proves to be the strictly terrestrial phase of the plant. 
When growing in dry soil the plant is “always sterile,’ and under 
these circumstances has smaller, or at least differently shaped 
leaves with short appressed characteristic pubescence, and of 
course lacks the fistulous stems. 
RIPARIAN PHASE. There is another very peculiar habitat 
in which the plant has the characteristic appearance of the sterile 
terrestrial as to the stem and leaves, but blooms freely. Con- 
cerning this Dr. Lunell says, ‘‘I believe this form has to be called 
riparian. Bottom of lowest course of ravine, boggy and thor- 
ughly soaked, but no visible water.’”’ The specimen is over a 
metre high and has been broken off at that. The leaves resemble 
those of the terrestrial phase except that they are much larger, 
and the nodes are somwehat swollen. The specimen was collected 
Aug. 12, 1906 at Butte Benson County, N. Dak., by Dr. Lunell. 
Another plant sent me by him was collected by J. F. Braenkle 
at Kulm, N. Dak. July 20, 1910 and though smaller shows 
the characteristic creeping habit sending up new aerial shoots. 
