''Persicaria microcephala'' (syn. ''Polygonum microcephalum''), the small-headed knotweed, is a species of flowering plant in the family

Polygonaceae The Polygonaceae are a Family (biology), family of flowering plants known Common name, informally as the knotweed family or smartweed—buckwheat family in the United States. The Botanical name, name is Basionym, based on the genus ''Polygonum'', ...

. It is native to the Himalayas, and central and southern China, and it has been introduced to Great Britain. Its cultivar 'Red Dragon' has gained the

Royal Horticultural Society The Royal Horticultural Society (RHS), founded in 1804 as the Horticultural Society of London, is the UK's leading gardening charity. The RHS promotes horticulture through its five gardens at Wisley (Surrey), Hyde Hall (Essex), Harlow Carr ...

Award of Garden Merit The Award of Garden Merit (AGM) is a long-established award for plants by the British Royal Horticultural Society (RHS). It is based on assessment of the plants' performance under UK growing conditions. It includes the full range of cultivated p ...

Subtaxa

The following varieties are accepted: *''Persicaria microcephala'' var. ''microcephala'' *''Persicaria microcephala'' var. ''sphaerocephala''

References

microcephala Flora of the Indian subcontinent Flora of Tibet Flora of North-Central China Flora of South-Central China Flora of Southeast China Plants described in 1913 {{Polygonaceae-stub