POLYGONUM. 
145 
pled, brancbmg near the summit; radical 
leaves spatulate, obtuse, cauline ones lance- 
olate, small ; flowers capitate, beads sqaar- 
rose, corymbed ; calycine wings setaceous, 
acuminate. 2-3 f. S. 
hoykin"ia, (g-w.) flowers cristate ; stem 
eimple ; leaves 4-5 verticillate. ablong-oval, 
lanceolate or acute ; upper ones scattered ; 
fipike solitai^, long-peduncled, lax-flowered. 
cymc/xa, (.1. Au. y.) cyme simple ; spike- 
lets ovate ; wings elliptical-oblong, ratber 
obtuse, mucronate ; superior sepal half as 
large as tbe wings, ratber obtuse ; lateral 
petals distinct nearly to tbe base ; crest 
minute ; seed sub-globose, glabrous ; stem 
simple, terete, attenuated upward ; radical 
leaves linear-spatulate, cauline ones linear- 
subulate, minute. 2-5 f. 
POL"YGO'NUM. 8—3. (Polygoneai.) [From 
poluss many, and gone, a joint, on account of 
the many joints in its stem.] 
1. F J outers axillary, 
avicvla're, (knot-grass, w. M. 2X-) leaves 
tanceolate. scabrous at tbe margin ; stipules 
fibort, laciniate ; stem procumbent ; flowers 
6ub sessile, axillary, minute. 6-12 i. 
f'igop"yrnm. (buckwheat r-w. Ju. 0.) 
racemes panicled; leaves beart-sagittate ; 
stem erectisb, unarmed ; angles of the seeds 
equal. 1-2 f. Ex. 
orien'tale, (prince's feather, r. Au. %.) 
stem erect; leaves very large, petioled, 
ovate, acuminate, minutely pube.scent ; .stip- 
ules hairy, somewhat sabre form; flowers 
in crowded, terminal spikes. 4-5 f. Old 
fields and road sides. Flowers in large, 
pendulous, crimson spikes. Naturalized. 
erec"tum, (w. J. 2^.) stem branched ; 
leaves broad, oval, petiolate ; flowers pen- 
tandrous. 1-3 f 
mtiriti'mnm, (w-r. Au. ^ .) stamens 8 ; 
leaves lanceolate, thick and glaucous, mar- 
gin i-evolute; stipules lacerate; stem dif- 
fuse, prostrate, sufTruticose. 1-2 f S. 
tenf've, (w. Ju. stem erect, slender, 
branched, acute-angled ; leaves long-linear, 
straight, acuminate ; stipules tubular ; apex 
villose ; flowers alternate, sub-solitary. 
9-18 i. 
2. Flowers in slender spikes. 
lapathifo'linm. (r. w. Au. ©.) stipules 
awnless ; stamens 6 ; styles 2 ; peduncles 
scabrous ; spikes numerous, ratber crowd- 
ed ; leaves lance-ovate, short-petioled, pu- 
bescent above. 2-4 f. 
pnncta'tum, (water-pepper, w. Au. @.) 
flowers octandrous, glandular; styles 3; 
stipules ciliate, spotted; leaves lanceolate, 
glabrous ; spike filiform, at first cernuous ; 
bracts remotely alternate. 1 2 f 
mi'te, (tasteless knotweed, J. 0.) flowers 
octandrous, in crowded spikes ; styles 3 ; 
leaves narrow-lanceolate, sub-hirsute ; stip- 
ules hirsute, long-ciliate ; bracts ciliate, sub- 
imbricate. 12-18 i. 
Virginia' nnm, (w. Ju. 2^.) stamens 5; 
styles 2, unequal; stem simple, angular; 
leaves broad-oval ; spikes virgate ; flowers 
remote. 2-4 f. 
bistortoi'des, (w-r. J. 2]!.) bracts 1 -flow- 
ered, 2-3 valved ; leaves oval, flat, petioled j 
stem simple, I -spiked. 
3. Flowers in thick craivded spikes, 
vivipa'rvm, (r. Au. 2_f-) stem simple; 
spike linear, solitary; leaves lance-linear, 
margins revolute ; bracts ovate, acuminate. 
6 i. 
barbaftum, (r. w. Ju.) stamens 6 ; styles 
3 ; spike virgate. truncate ; bristle ciliate ; 
leaves oblong, acute, smoothish. 18-24 i. 
persicn'ria, (r. Ju. @.) stamens 6 ; styles 
2 ; spikes ovate oblong, erect ; peduncles 
smooth ; leaves lanceolate ; stipules smooth- 
ish, ciliate. 1-2 f 
peans^ylva'nicum, (Ju. flowers octan- 
drous; spikes oblong; leaves lanceolate; 
.stipules smooth and naked; stem genicu- 
late. 2-4 f. 
amphib"ium, (mud knotweed, Ju. r. 2.^.) 
leaves petiolate, oblong-lanceolate, some- 
times cordate at base ; flowers in dense, ter- 
minal spikes, pentandrous; styles bifid; 
stem nearly erect. Var. te.rres"tre, leaves 
smooth above, slightly pubescent beneath , 
spike ovate, oblong. Var. aquat/'icum 
leaves floating, ovate-lanceolate ; spike cy- 
lindric-oblong. 
4. Floirers in spiked panicled racemes. 
orticula'tum, (joint weed, r. Ju. 
leaves linear, obtuse ; flowers octandrous , 
styles 3 ; spikes paniculate, filiform, erect ; 
pedicels solitary, articulate near the base. 
Sandy plains. 
5. Flowers sub-rncemed ; leaves cordate, 
sagittate, or hastate, 
sagitta'tum, (w. J. @.) stem prostrate, 
square ; the angles awned w ith reversed 
prickles; leaves sagittate; flowers octan- 
drous, in small peduncled heads. Wet 
grounds. 
arifo'linm, (r-w. .Tu. ^.) stem prostrate, 
square, the angles with reversed prickles ; 
leaves long-petioled, ha.state ; spikes few- 
flowered ; flowers hexandrous ; styles 2 or 
1. 2 4f. 
co7ivol"vulns, (w. r. Ju. @.) stamens 8 ; 
styles 3 ; leaves petioled, oblong, hastate- 
cordate ; stem long, twining ; segments of 
the perianth bluntly keeled. 
scan"dens, (climbing buckwheat, w. r. 
Au. 2i.) stamens 8 ; styles 3 ; leaves broad- 
cordate ; stipules truncate, naked ; stem 
twining, glabrous ; calyx bearing the fruit 
3 -winged. 
cilino'de, (Ju. @.) stamens 8 ; styles 3 ; 
leaves cordate ; stipules sub-acute, sur- 
rounded at the base with an outer ciliate 
series ; stem angled, pro.strate or climbing ; 
divisions of the calyx obtusely keeled. . 
kirsu'tum, (w. Ju. @.) stamens 7 ; styles 
3-cleft ; spikes filiform ; stem and stipules 
very hirsute ; leaves lanceolate, hirsute, 
punctate. 2 f. S. 
Jimbria'tnm, (w. Au.") spikes panicled ; 
flowers solitary, fimbriate; stipule truncate, 
fringed ; leaves linear, acute at each end. 
2 f. S. 
seta'ceum, (w. Ju.) flowers octandrous j 
.styles 3-cleft ; peduncles long, 2-spiked ; 
spikes interrupted, hirsute ; leaves br«ad> 
