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 Black Bindweed
Polygonum convolvulus
From
Missouri Plants
Stems - Twining, herbaceous, to +1m long, angled or ribbed, retrorse
strigose on angles and ribs, often reddish in strong sun, branching, multiple
from base.
Leaves - Alternate, petiolate. Petioles with a deep
adaxial groove, retrorse strigose, to +2cm long. Blades sagittate, acute to
acuminate, entire, glabrous, strigillose on the margins, to +4cm long, +3cm
broad.
Inflorescence - Axillary and terminal flowers.
Axillary flowers typically single or paired. Terminal flowers in bracteate
racemes, in whorls of 4 at each node of the raceme, often subtended by reduced
foliaceous bracts. Axis of racemes retrorse strigillose. Pedicels reddish in
strong sun, 1-2mm long, mostly glabrous.
Flowers - Perianth greenish and often with whitish
or pinkish apical margins, quickly expanding in size to 4mm long (1-2mm in
flower). Stamens 6-8. Anthers pinkish, bilobed, .3mm broad. Filaments short,
white, glabrous, .5mm long. Ovary superior, green, glabrous, 3-angled, .7mm long
in flower. Style short, green, glabrous, .1mm long. Stigma green, capitate,
.1-.2mm broad. Seeds dull black but shiny on the angles, 3-angled, to 3mm long.
Flowering - May - September.
Habitat - Waste ground, disturbed sites, open
woods, roadsides, railroads.
Origin - Native to Europe.
Other info. -
Steyermark reported that natives used to grind the seeds and make flour.
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