This species has gone through several name changes, as can be seen fron the list of synonyms. It has at times been listed as a variety of Persicaria virginiana, or even as Persicaria virginiana in the literature. The two species, whilst closely related, are considered as distinct in all modern reference works, and to have distinct distributions. Persicaria filiformis is native to much of Asia whilst Persicaria virginiana is native to N. America.
Some of the entries in this record were originally listed under Persicaria virginiana, but since they relate to the Asian species, they have been transferred here[
Antenoron filiforme (Thunb.) Roberty & Vautier
Persicaria filiformis albiflora (Hiyama) Yonek.
Persicaria virginiana albiflora (Hiyama) J.M.H.Shaw
Persicaria virginiana filiformis (Thunb.) J.M.H.Shaw
Polygonum apoense Elmer
Polygonum filiforme Thunb.
Polygonum virginianum filiforme (Thunb.) Nakai
Sunania filiformis (Thunb.) Raf.
Tovara apoensis (Elmer) H.L.Li
Tovara filiformis (Thunb.) Nakai
Tovara filiformis albiflora Makino ex Hiyama
Tovara ryukuyuensis Masam.
Tovara smaragdina Nakai ex F.Maek.
Tovara virginiana filiformis (Thunb.) Steward
Persicaria filiformis is a herbaceous perennial plant with stout rhizomes; it produces a clump of erect stems around 50 - 80cm tall[
The plant is harvested from the wild for use as a medicine and possibly also as a food.
E. Asia - Himalayas of Pakistan and India, southern China, Korea, Japan, Vietnam, Philippines
Forests, thickets, valleys; at elevations from 100 - 2,500 metres[
]. Woods and thickets in lowland and hills all over Japan[
Species in this genus generally succeed in an ordinary garden soil, whilst preferring a moisture retentive not too fertile soil in sun or part shade[
]. They generally rpays generous treatment[
Most plants in this genus seem to be immune to the predations of rabbits[
Leaves - raw or cooked[
We have no specific information for this species, but the seed of most, if not all, members of the genus is edible both raw and cooked, and is potentially a good source of amino acids. Unfortunately the seed is also usually rather small and fiddly to utilize[
The plant is astringent, demulcent, diuretic, pectoral and tonic[
]. It is used in the treatment of haemorrhages and fluxes[
Seed - sow spring in a cold frame. Germination is usually free and easy.