Fallopia convolvulus, the black-bindweed or wild buckwheat, is a fast-growing annual flowering plant in the family Polygonaceae native throughout Europe, Asia and northern Africa. It is an arable plant.
Synonyms include Polygonum convolvulus L. (basionym), Bilderdykia convolvulus (L.) Dumort, Fagopyrum convolvulus (L.) H.Gross, Fagopyrum carinatum Moench, Helxine convolvulus (L.) Raf., Reynoutria convolvulus (L.) Shinners, and Tiniaria convolvulus (L.) Webb & Moq. Other old folk names include bear-bind, bind-corn, climbing bindweed, climbing buckwheat, corn-bind, corn bindweed, devil's tether, and wild buckwheat.
Black-bindweed is a herbaceous vine growing to 1–1.5 m (39–59 in) long, with stems that twine clockwise round other plant stems. The alternate triangular leaves are 1.5–6 cm long and 0.7–3 cm broad with a 6–15 (–50) mm petiole; the basal lobes of the leaves are pointed at the petiole. The flowers are small, and greenish-pink to greenish white, clustered on short racemes. These clusters give way to small triangular achenes, with one seed in each achene. The flowers have 5 sepals, the 3 outer ones are larger and show a keel. It has 5 stamens and the fruit grows to 4 mm long.
While it superficially resemble bindweeds in the genus Convolvulus there are many notable differences; it has ocrea (stipule-sheath at nodes), which Convolvulus does not; and Convolvulus has conspicuous trumpet-shaped flowers while Black-bindweed has flowers that are unobtrusive and only about 4 mm long.
Fallopia convolvulus grows most commonly on disturbed or cultivated land, in northern Europe typically on warm, sunny, well-drained sandy or limestone soil types, but in hotter, drier areas like Pakistan, on moist shady sites. It ranges from sea level in the north of its range, up to 3600 m altitude in the south in the Himalaya.
Cultivation and uses
The seeds are edible, and were used in the past as a food crop, with remains found in Bronze Age middens. The seeds are too small and low-yielding to make a commercial crop, and it is now more widely considered a weed, occurring in crops, waste areas and roadsides. It can be a damaging weed when it is growing in a garden or crop, as it can not only damage the plant it entwines itself around, but can also hinder mechanised harvesting. It is also an invasive species in North America.
Brooke, C. 2018. Court victory for couple in knowtweed tangle with neighbor. Daily Mail Saturday. 2018 p. 43
- The Plant List, Fallopia convolvulus (L.) Á.Löve
- Flora of NW Europe: Fallopia convolvulus
- Flora of China: Fallopia convolvulus
- Flora of Pakistan: Fallopia convolvulus
- Blamey, M. & Grey-Wilson, C., 1989. Flora of Britain and Northern Europe. ISBN 0-340-40170-2.
- "Fallopia convolvulus". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 24 December 2017.
- Phil Wilson & Miles King, Arable Plants – a field guide: Black-bindweed
- Parnell, J. and Curtis, T. 2012. Webb's An Irish Flora. Cork University Press. ISBN 978-185918-4783