POLYGONACEAE 459 
Outer sepals unchanged or merely keeled at maturity. 
Ac o en dull: inflorescence of axillary and terminal — and s 
ple 1. iones 
Ae leno. poses shining: inflorescence of axillary and 
terminal panicled racemes. 2. B. cilinodis. 
Outer sepals CODE conspicuous wings. i 
Sepal-wings not incised. : 
ature perth 6—8 mm. long, wings flat. 9. B. dumetorum. 
ature p 10-15 mm. long, wings crisped. 4. B. scandens. 
Sepal-wings incised. 5. B. cristata. 
1. B. Convolvulus (L.) Dum. Stem and branches trailing or twining, green 
or purple- tinged: leaf-blades ovate to ovate- ae or those of the upper 
ones sagittate, 1.5—6 cm. long: ds ae rough- 
edged: per E Deus about 4 mm. long; 
p PE iare the saa becoming 
the achen 
ine s ea epa Mu 
WHEAT. )—Cult. grounds, it on and 
fields, various provinees, Fla. to e PEN 
and S Can. Nat of Eu.—(W. I x.) 
2. B. cilinodis (Michx.) NK tem 
prostrate or twining, purple: leaf-blades 
er: achen 
ocky piace ind thickets, "Blue Ridge and more northern pro- 
vinces, N. C. to yr ees d N. S. 
B. dumetorum ae Dum. Stem twining, purple-tinged: leaf- Asi ovate 
to ovate-hastate, 2-7 cm. long: p P perianth becoming 
long: achene about 3 mm. long o UE EAT.)—Thickets, various pro- 
vinces, heal in the E U. S. UN at. 
4. B. ens (L.) Greene. Bim and branches twining, purplish: leaf- 
blades Dus to go Ps 4—12 em. long: ocreae with rough ridges: perianth 
becoming 10- long: achene 4—4.5 mm. long.—(HEDGE-BUCKWHEAT. 
PUR M )— Thickets "m fence-rows, various provinces, Fla. to 
Tex. and S Can 
tata (Engelm. & Gray) Greene. Stem and branches n green 
2 purplish: leaf- pane ovate to A apace 1-6 em. long: perianth becoming 
-7. . long: e 3 mm. long. AIDE fence- -rows, and river banks, 
various ce Fla. ps Tex., Okla., and Mas 
15. PLEUROPTERUS Turcz. Perennial, often large many-stemmed herbs 
with extensively spreading rootstocks. Leaves alternate: blades broad, com- 
ly. date at 
Flower erous, bor short axillary 
clustered or branching panicl Sepal A Ur 
mostly 5, the 3 outer ones developed into I: 
rm wings at maturity. 8 
NERO 
Ya 
ECT 
ments united at the base. Stigmas 3, short- 
fimbriate. Achene ME included.— 
About 4 species, Asiati 
P. Zuccarinii Small. Large nearly on 
brous herb with hollow stems 1-3 m. 
N 
