234 AMERICAN MIDLAND NATURALIST 
for its remarkable pubescence. On the other hand the sterile 
spring phases with unmistakably large margins to the ochrea 
leaves it as a closer ally to P. Hartwritghw in spite of the appear- 
ance and habit of the flowering plants. To sum up P. tanaophylla 
still blooms in the strictly aquatic phase and, not having margins 
to the ochrea, is a member of the Emersa group. P. carictorum 
has only a vestigial aquatic phase in which it never blooms, and 
has borders to the ochrea in terrestrial plants, but only in sterile 
spring plants. P. mesochora with a different foliage from the latter 
blooms evidently more normally in the aquatic than the terrestrial 
phase, and has margins to the ochrea in spring plants only and is 
glabrate in the terrestrial flowering phase. 
I have met in the U. S$. National Herbarium but one specimen 
that may possibly be referred to this species, and that not with 
absolute certainty, as it is only a sterile plant. It is No. 148853, 
collected by H. N. Patterson at Oquawka, Ill. in the Mississippi 
bottoms. No date is given beyond “Sept.’’, without day or year. 
P. carictorum seems to thrive best along the borders of a 
pond where it is near water, or in muddy boggy places among 
sedges and Dulichiwm species. It is abundant in the shade of the 
southern shore growing under willows and Cephalanthus the shade 
having no apparent effect on the pubescence of the plant. Other 
plants of the group growing with it are P. grandzfolia and P. 
coccinea. 
PERSICARIA MESOCHORA Greene (1904) Leaflets vol. I., p. 28. 
Of the specimens of this species which I have found in the 
U. 5. National Herbarium and that of the New York Botanical 
Garden, the following are more or less notable. 
U. S$. National Herbarium: 443325, Slough, Dune Park. 
IX., 7, 1903. Collector’s No. 2097. ‘Terrestrial phase. 434581, R. 
Cratty’s Emmet~ Co., Iowa; VII. and™ VIII.; 1895. > Aquate 
284691, J. Macoun’s Hull, Ontario, IX., 6, 1889. Riparian or 
subaquatic. Labelled “P. emersum.” 593947, O. A. Farwell’s , 
352, Belle Isle IX., 23, 1892. Aquatic. “ Deep water, stems several 
feet long.”’ Marked “P. amphibium coccineum.’’ 343986, W. C. 
Kendal’s N. Windham, Me. VII. 6, 1889. Aquatic. (Owing to 
the close resemblance of the aquatic phases of P. mesochora and 
P. coccinea though otherwise so very different, this specimen is 
more likely to be the aquatic of the latter.) 45465, F. V. Coville’s 
