562 POLYGONACEAE. 
‘21. Polygonum littorale Link. Shore 
Knotweed. (Fig. 1338.) 
Polygonum littorale Link in Schrad. Journ. 1: 54. 
1799. 
Annual or perennial, stout, glabrous, bright 
green or slightly glaucous, stem 1°-4° long, pros- 
trate or ascending, diffusely branched from a 
wooly base, striate. Leaves oblong, oblong-lan- 
ceolate or oblanceolate, 2’’-9’’ long, obtuse or 
subacute at the apex, mostly acuminate at the 
base, prominently veined, often crisped, jointed 
to the ocreae; ocreae oblique, 2-parted, at length 
lacerate; flowers axillary, 2-6 in each cluster; 
calyx green, its lobes whitish-margined or car- 
mine; stamens 8; style short, 3-parted to the base; 
achene broadly ovoid, 3-angled, 114’’ long, more 
or less narrowed at the base and apex. 
On shores and in waste places, New Brunswick to 
Minnesota and California, south to Virginia, Illinois 
and Kansas. Alsoin Europe. Aug.—Sept. 
22. Polygonum Bellardi All. Bellard’s 
Knotweed. (Fig. 1339.) 
mokaseneim Bellardi All. Fl. Ped. 2: 205. pl. 90. f. 2. 
1785. 
Annual, dingy green, stem slender, prostrate or 
spreading, 1°-3° long, simple or diffusely branched, 
striate. Leaves oblong-lanceolate or linear-lanceo- 
late, short-petioled, 2’’-20’’ long, acute at the apex, 
acuminate at the base, distant, prominently veined 
beneath, jointed to the ocreae; ocreae oblique, sil- 
very, slightly lacerate when young, becoming much 
incised when old; flowers 1-3 together in the axils; 
calyx green, its lobes white-margined; stamens 8; 
style 3-parted to the base, very short; achene ovoid 
or oblong-ovoid, 3-angled, rather pointed at both 
ends, 1//-1/’’ long, reticulated and rather dull. 
In waste grounds, Washington, D. C. Adventive 
from eastern Europe or western Asia. 
23. Polygonum maritimum LL. Seaside Knotweed. (Fig. 1340.) 
Polygonum maritimum I,. Sp. Pl. 361. 1753- 
Polygonum glaucum Nutt. Gen. 1: 254. 1818. 
Perennial or sometimes annual, glaucous, gla- 
brous, root usually deep, woody, stem prostrate 
or ascending, branched, 8’—20’ long, deeply 
striate. Leaves ovate or oblong, mostly equal- 
ling or longer than the internodes, 3’’—12’’ long, 
fleshy, veined beneath, somewhat rugose above, 
conspicuously jointed to the ocreae, the margins 
often revolute; ocreae large, silvery, 2-parted or 
at length lacerate, becoming brown at the base; 
flowers 1-3 together in the axils, becoming slen- 
der-pedicelled; calyx white or pinkish; stamens 
8; style short, 3-parted; achene 3-angled, ovoid or 
narrowly ovoid, 114’’ long, acute or acuminate, 
smooth, shining, longer than the calyx. 
In sands of the seashore, Maine to Florida. Also 
on the coast of Europe. July-Sept. 
