Bidens pilosa

Bidens pilosa L. is a dye plant.

Colors
It yields a yellow colour.

Parts used
All the plant, roots included, according to Trillo (2007). But only stems and flowers, according to D'Harcourt (1962), Middendorf (1973) and Yacovleff and Herrera (1934).

Recipes
Ruiz y Pavón (1798) reported the dyeing of cotton and wool to a rusty colour with this Bidens, Caesalpinia spinosa, urine, black soot, lemon juice and alum.

Synonyms
Local names are: amor seco in central Argentina.