sis tent, perianth. 
Capers O Stems twining; leaves cordate; growing near habitations J. Be Convolvulus 
4. Polygonum L. Knotweed. 
OF tte Q +e DS; ered c AB Stes 
in general lanceolate, entire, petiolate 
With thegocrea, commonly continuous wi ° 
pay or perennia 
of varied habit. Leaves alternate, 
or sessile, frequently jointed 
and 
Pr \Jia2 & = ss iegr ou 
? o Flowers small, commonly pinkish 7 
or white, perfect, borne in smalfeclusters, the clusters axillary or disposed 
in spikes, racemes or panicles, or crowded into terminal glomerules with 
modified overlapping bracts; perianth 5-parted; stamens commonly 5-8; styles 
2 or 5 parted; achene lenticular or J-angled, commonly enclosed in the per- 
4 
9 
—— 
o Stems not twining; leaves lanceolate to linear, rounded 
4 to attenuate at the base 
@ Leaves 1-5 cm. long, commonly oblong-lanceolate to 
( linear; annuals, 2-40 cm. tall 
Flowers crowded into g~lomerules 1 cm. or less 
g /iong at the tips of branches, the bracts 
\ overlapping 
(> Bracts oblong-elliptical with broad, white- 
/scarious margins. (See also the next two 
: \ species | 2, Be polygaloides 
—— 
(> Bracts lanceolate, tapering, margins not 
fo scarious or but slightly 
raee Spee 
& Perianth white with green ribs; achenes 
7zZ Shining and smooth § Ps unifoliun 
@ Perianth white,veined with pink; achenes 
12, dull, minutely rugose 4, Pe Watsoni 
4 Flowers in axillary clusters of l-several ,dis- 
tributed along the stem, or borne in loose 
& { racemes toward the ends of the stems, the 
bracts leaflike, gradually reduced upwards 
l) Leaves not strongly reduced upwards; branches 
/e not angled 
& Leaves linear-oblong; plant more or less 
/2, prostrate, often mat-like S Ee aviculare 
f& Leaves oval or ovovate; plant erect G6. Be minimun 
—_— { 
