478 
of the large white flowers which are about 6 mm. in diameter. 
The achene, besides being larger than in the normal form, is more 
distinctly granular and often rather dull, and I have found no len- 
ticular ones on the plants at hand. 
It ranges southward through the Atlantic States from Massa- 
chusetts, and occurs also in Mexico, Central and South America. 
POLYGONUM LONGISTYLUM Small, Bull. Torr. Club, 21: 169 (1894). 
Since describing the above species I have seen specimens from 
New Madrid Co., Missouri (Bush, No. 177); New Orleans, 
Louisiana (Ingalls); Alexandria, Louisiana (Hale); Indian Terri- 
tory (Palmer, No. 286). 
PoLtyGonum MExicanum Small, Bull. Torr. Club, 19: 356 (1892). 
In 1883 P. Mexicanum was gathered as far south as Camaron, 
Mexico, by J. N. Rovirosa. 
PoLyconum OpetousaNnum Riddell; Small, Bull. Torr. Club, 19+ 
354 (1892). | 
Since the writing of my last note concerning the above 
species* it has been found in Newton county, Missouri, by Mr. 
B. F. Bush in September, 1893. He records it as growing #1? 
swampy places and as being uncommon, and distributed it as P. 
acre leptostachyum (321), which form, however, it does not re- 
semble. The plant is thus brought within the limits of our com 
ventional Northern Flora, and, like various other Southern species, — 
it follows the Mississippi River Valley as far north as the swamps 
of southeastern Missouri. The specimens of this collection are very 
much like the type, both in their external appearance as 1” the : 
very slender build, the strict and erect branches and the numerous» 
and linear leaves, and in the minute characters of the achene, the 
| flowers and the strongly and conspicuously fringed ocreole. 
PoLyGonum seraceum Baldw.; Ell. Bot.S. C. & Ga. 1: 455 (1817 ) 
Heretofore confined to the Southern States, this form has lately 
been collected at three different stations within the bounds of the 2 
‘Northern Flora. Mr. Bush made two collections (114, 118) of # = 
. : e 
in Dunklin county, Missouri, in September, 1893. In the ga & 
tler county 
_ month and year Mr. H. Eggert found the plant in Bu 
_ * Bull. Torr. Club, ar: 168. 
