358 
23. POLYGONUM INCARNATUM, EIl. Sketch i. 456 (1817). 
P. lapathifolium, L. var. incarnatum, S. Wats. in A. Gray, 
Man. Ed. 6, 440 (1890). 
Vermont: Middlebury (Brainerd); New York: Coney Island 
(Britton); New Jersey: Lake Grinnell (Britton); Pennsylvania: 
Harrisburg (Small) ; Illinois: Rockford (Goddard) ; Kentucky : 
Lexington (Short); Florida (Chapman); Louisiana: Red River 
(Hale); Feliciana (Carpenter). 
It is better and more consistent to hold P. zxcarnatum as a 
species than to reduce it to a variety of P. lapathifolium. Itisa 
native of North America, and has a well marked and restricted 
range, whereas P. /apathifolium is most likely an introduced spe- 
cies, and has become of a much more cosmopolitan character. 
24. POLYGONUM DENSIFLORUM, Meisn. in Mart. FI. Bras. v, 
13 (1855.) 
P. acuminatum, Meisn. Mon. 78, in part (1826). 
P. densiflorum, Meisn. var. imberbe, Meisn. in D.C. Prodr. 
xiv, 121 (1856). 
P. glabrum, Authors, not Willd. 
Florida (Chapman 91); Lake Monroe (Rugel, 199) ; Louisi- 
ana: Alexandria (Hale); New Orleans (Riddell; Ingalls); Mar- 
tinique (Jardin, 302); British Guiana (Jenman, 1628). 
Var. CILIOLATUM, Meisn. in D.C. Prodr. xiv. 121 (1856). 
British Guiana: Lama (Jenman, 4697); Hooroobea (Jenman, 
5114). 
Polygonum glabrum, a species related to the foregoing has 
long been credited to America. This is due to the erroneous de- 
termination of certain forms of P. densiflorum and P. lapathifol- 
tum. P. glabrum is an East Indian species, and after a careful 
study and comparison of a large amount of American material 
with the true eastern P. glabrum, all the American specimens re- 
fered to P. glabrum, prove to be forms of P. densiflorum and 
P. lapathifolium. 
25. POLYGONUM DIOSPYRIFOLIUM, C. and S. Linnza, iii. 47 
(1828). 
Brazil: prov. Rio Janeiro and Minas (according to Meisner). 
26. POLYGONUM PERUVIANUM, Meisn. in D.C. Prodr, xiv. 122 
(1856). 
