POLYGONACEAE 
II. LAPATHIFOLIA 
Ocreae not fringed with bristles, rarely EREE E E 
ciliate when youn 
Panicle Sieny erect, stout. 
Achene turgid- lenticular : plant perennial. 
Achen ne fia at, the fa concave or merely umbonate: 
plant a 
ants with much variation 
e style lengths, the styles in the PERA 
styled forms, conspicuously exserted : achen 
ovate, the faces more or less umbonate. 
ml m c ue d creeping woody 
ng. 
Plant perennial: achene dull. 
Flowers with slight variation in the style-lengths, 
2i Styles not conspicuously exserted: achene 
early M the uk es flat or concave. 
Panicle Soddins. rather slender 
em fringed with bristles. 
branches, and peduncles hispid and more or less 
glan dular 
Stem, branches S, and peduncles not hispid. 
Sepals not cru cl 
SUE Dar OWEN at the S manifestly 
oled: stem e ocreae glabrous or 
Ei reed 
iiie ciliate. 
Ocr ie strigillose, with marginal cilia: 
eaf- s ee glabrous or sparingly 
Std 
Calyx cum white: achene nearly 
wide as long, - tip protrud- 
pe Dena the caly 
Calyx Tee Pa p? urplish- 
pink: manifestly D 
than ide. ‘the tip covered ove 
Ocreae loosely strigose, with lon 
co E e marginal cilia: leaf-blades 
iously ORe strigose. 
Oae e ecilia 
ee cordate or subcordate at the base, 
or : stem, at least below 
ne ode aud eee hirsute. 
SEDE Dustulcte puntale 
ene granular, dull: panicle nodding. 
d CDoHe smooth, shining: panicle erect. 
ES 
Tall rather coarse annual with usu ally numerous dense 
cylindric nodding panicles of pone cole ed flowers. 
Muhlenbergii (Meisn.) S 
ES blades i ts to elliptic- to. 5-20 c 
at the base: ocreae strigose: pane es com- 
paet, 3-10 em. long: p i i 
m. 1 
Perennial, aes 
Pun [tH ME o mm. 
emersa (Mich E E 
— dy shores, swamps, and ditches, vari- 
ous provinces, Fla. to Tex., Calif, B. C., 
Ont., and Que.—(Mez. 
P. portoricensis (Bert E Small. Per 
iu generally glabrous: leaf-blades rigen 
late, usually narrowly so, 3-25 . long, 
acumin ocreae very thin: panicles lax, 
but often copiously flowered : ocreolae cili- 
ate: perianth becoming 3.5-4 mm. long; 
sepals white or whitish, punctate: achene 
15. 
ally 
m. long, rounded or cordate 
P. 
. portoricensis. 
longistyla. 
mississippiensis. 
. pennsylvanica 
lapathifolia. 
. Careyi. 
. Persicaria. 
. opelousana. 
. hydropiperoides. 
etacea. 
paludicola. 
hirsuta. 
Hydropiper. 
punctata, 
orientalis. 
strigose, ereeping: 
