Persicaria bistorta

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Common products:
Young shoots and leaves are collected as a wild vegetable, often blanched, boiled, or boiled to reduce tannin content; rhizomes are occasionally roasted. Reports describe preparation as a confectionery (“meadow-sweet jelly”) from boiled rhizomes.

Food and beverages (non-medicinal):
- Greens: Young shoots/leaves used as a potherb; processing (boiling, soaking, or blanching) reduces tannins; used in foraging literature (e.g., Francis-Baker 2011). - Confectionery: Rhizomes boiled to a sweet, translucent jelly (“meadow-sweet jelly”) are reported historically (Cox 1917). - Nutritional/chemical: Leaves contain carbohydrates (≈17–19%), protein (≈16–20%), ash (≈5–6%), fiber (≈16%), fat (≈2–3%), and significant tannins (as gallotannins/ellagitannins) that inform flavor and post-harvest processing (Kapoor et al. 2021, Plant Foods for Human Nutrition). The high starch/reserve carbohydrate content of rhizomes underlies confectionery applications (Kapoor et al. 2021). A small study reported dietary use without health claims (Mishra et al. 2012).

Colorants and tanning:
Rhizomes/roots yield brown and red-brown dyes and tanning extracts (Cox 1917; Francis-Baker 2011). Dyes are suitable for protein fibers; the application class is natural brown/red-brown dye for textiles (Francis-Baker 2011). Tannin type is gallotannins/ellagitannins (Kapoor et al. 2021), which support leather tanning and brown dyes.

Wood and fiber:
Leaf stems yield bast fiber used for cordage; quality is described as modest (Francis-Baker 2011). Rhizomes provide starch (Kapoor et al. 2021), but culinary use is historically favored over industrial starch processing.

Scientific/model-organism use:
- Secondary metabolite studies on condensed/gallotannins for ecological roles and chemotaxonomy (e.g., Acta Societatis Botanicorum Poloniae, 1978; Khim. Prir. Soedin. 1974). - Reference genome or curated genomic resources: a draft genome for Persicaria bistorta was published (Sci Data 2020). - DNA barcoding and molecular phylogenetics use this taxon (e.g., DOI:10.1186/s12862-015-0487-8).

Properties relevant to use:
Leaves: high tannins (gallotannins/ellagitannins; total phenolics ≈12–18%) enable tanning and dyeing; moderate fiber supports cordage; starch and protein underpin forage/vegetable use (Kapoor et al. 2021). Rhizomes: high reserve carbohydrates (starch) and tannins enable confectionery and tanning extracts (Francis-Baker 2011; Kapoor et al. 2021).

Sustainability and sourcing:
Wild-collection for dye, tanning, and food is reported; local, non-wood harvesting of rhizomes/greens can be sustainable when stands are abundant and harvesting is limited (Francis-Baker 2011). No specific standards/regulatory frameworks identified for dye/tanning/food uses beyond general wild-food safety guidelines; no ISO/ASTM/EN or national timber standards are applicable.

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