BUCKWHEAT FAMILY. 5577 
6. Polygonum incarnatum Ell. Slender 
Pink Persicaria. (Fig. 1323.) 
Polygonum incarnatum Ell, Bot. S.C. & Ga. 1: 456. 1817. 
Annual, glabrous or nearly so, stem erect, simple 
or branched above, more or less swollen at the nodes, 
2°-4° tall. Leaves lanceolate, 3/-9’ long, 14/-114’ 
wide, acuminate at both ends, short-petioled, sparingly 
punctate and ciliate; ocreae cylindric, long, loose, 
brittle, sometimes ciliolate when young, glabrous when 
mature; racemes panicled, drooping, 134/-4’ long, 
linear, many-flowered; calyx white or pink, small, 
5-parted; stamens 6; style 2-parted to near the base; 
achene ovoid-oblong, lenticular, about 1’/ long, flat or 
biconcave, smooth, shining. 
In wet soil, Vermont to Illinois, south to Florida and 
Louisiana. June- Sept. 
7. Polygonum lapathifolium L. Dock- 
leaved or Pale Persicaria. (Fig. 1324.) 
Polygonum lapathifolium V,. Sp. Pl. 360. 1753. 
Annual, stem simple or much branched, erect or as- 
cending, swollen at the nodes, 1°-3° high, the pedun-- 
cles and pedicels glandular. Leaves lanceolate or ob- 
long-lanceolate, 2’-10’ long, usually broader than 
those of the preceding, attenuate to the apex, acumi- 
nate at the base, short-petioled, ciliate, inconspicuously 
punctate; ocreae cylindric, ribbed or striate; racemes 
panicled, 1/-4’ long, drooping, narrow, rather dense; 
calyx pink, greenish or white, 5-parted; stamens 6; 
style 2-parted to below the middle; achene broadly 
oblong or ovoid, lenticular, 1’’ long, brownish or black, 
slightly reticulated but shining, its faces concave. 
In waste places, throughout temperate North America. 
Naturalized from Europe. Sometimes a troublesome 
weed. Native also of Asia. June-Sept. 
Polygonum lapathifolium nodosum ( Pers.) Small, Mem. Torr. Club, 5: 140. 1894. 
Polygonum nodosum Pers. Syn. 1: 440. 1805. 
Generally robust and glabrous; stem stout, reddish, purple spotted and with a purple ring be- 
low each ocrea, much thickened at the nodes; leayes conspicuously punctate; racemes 1'-3' long, 
less drooping, often erect; achene slightly larger. Occasional in the range of the type. 
Polygonum lapathifolium incanum (Schmidt) Koch, Syn. Fl. Germ. 711. 1837. 
Polygonum incanum Schmidt, Fl. Boem, 4:90. 1795. 
Low, stem slender, erect, 2'-12' high, slightly scurfy; leaves lanceolate, ovate or oblong, usu- 
ally narrowed at the base, white-tomentose beneath, glabrous above; racemes !4'-1%' long. In 
waste places, Nova Scotia to Ontario, New York and British Columbia, 
8. Polygonum Pennsylvanicum lL. 
Pennsylvania Persicaria. (Fig. 1325.) 
Polygonum Pennsylvanicum I,. Sp. Pl. 362. 1753. 
Annual, glabrous below; stem erect, simple or 
branched, 1°-3° tall, the upper parts, the peduncles 
and pedicels glandular. Leaves lanceolate, acumi- 
nate at the apex, petioled, ciliate, 2-11’ long, the 
upper sometimes glandular beneath; ocreae cylin- 
dric, thin, naked, glabrous; racemes panicled, erect, 
thick, oblong or cylindric, dense, 1-2’ long; calyx 
dark pink or rose-color, 5-parted; stamens 8 or fewer; 
style 2-cleft to about the middle; achene orbicular or 
mostly broader than high, 114’ long, short-pointed, 
lenticular, smooth, shining. 
In moist soil, Nova Scotia to Ontario, Minnesota, 
Florida and Texas. Ascends to 2000 ft. in Virginia. 
July-Sept. 
