OUR AMPHIBIOUS PERSICARIAS 235 
Potomac Flats, D. C., V. 11, 1890 (?). This is a sterile terrestrial 
labelled P. Hartwrighttt with spreading tips to the ochrea, and 
more closely resembles P. mesochora as to vegetative characters. 
Owing to the incompleteness of the specimen its status may be 
considered as indeterminable from the material at hand. 295743, 
F. V. Coville’s Preston, N. Y., VII, 28, 1886. Also sterile but with 
the foliage of P. mesochora. 295748, F. V. Coville’s Ithaca, N. Y., 
VII. 27, 1885. Also sterile, but aquatic. Labelled ‘““P. amphibiwm.”’ 
WS: Depts of Agric. Herb. Fk: V. Coville’s Oswego; N.Y. VI. 
29, 1887. Sterile terrestrial. 
New York Botanical Garden Herbarium: W. F. Wright’s 
Allegan Co., along the Kalamazoo River, IX. 10, 1902, in 3 ft. 
of water. Aquatic. N. L. Britton’s Buffalo, N. Y., VIII. 20, 1886. 
©. A. Farwell’s 325a Belle Isle, Mich., IX. 23, 1892. Aquatic 
phase. P. A. Rydberg’s, Platte near Horse Creek, VIII. 1, 1891. 
This most resembles the aquatic phase of specimens of which 
I found the terrestrials on the same rootstock at Notre Dame. 
Stewart H. Burnham’s, Bacon Pond, Washinton Co., N. Y., IX. 
20, 1900. Labelled “seems a form of P. amphibium L. growing 
where water subsided.”’ One specimen has leaves passing into 
those of the aquatic but smaller. All the specimens are like those 
I found here at Notre Dame. 
From C. C. Deam’s Herbarium a specimen from Steuben Co., 
Ind. VIII. 13, 1903. Swamps near tamarack lake, also his 
number 298, Noble Co., Waldren Lake, Orange Tp., VIII. 9, 1905. 
I have collected the following specimens of P. mesochora, 
all the plants being present in my herbarium. 864, Mineral Springs, 
Dunes of Lake Michigan, VI. 7, 1911. 906, Hick’s Crossing on the 
Interurban Electric Line to Michigan City, V. 20, 1911. Another 
specimen No. 907. These plants are sterile and the ochreae borders 
have already disappeared. 844, St. Joseph’s Lake, Notre Dame, 
Ind., VI. 2, 1911. Same locality as type of terrestrial already 
described in former paper. 
PERSICARIA MESOCHORA var. arenicola Nwd., nov. var. 
Planta terrestris fertilis differt a planta typica foliis magis 
strigosis pilis appressis. Internodes habet breviores hirtellos; 
ochreae ciliatas et spicas minores circa 2 cm. longas. Venas medias 
quoque habet appresse hirtellas quae in typica sunt tantum scabrae. 
Convenit plantae typicae forma foliorum et aspectu foliorum. 
