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Fabaceae - dyer's greenweed, Färber-Ginster
European deciduous shrub, up to 60–90cm tall; stems woody, slightly hairy, branched; leaves alternate, nearly sessile, glabrous and lanceolate; flowers golden yellow, borne in erect narrow racemes from spring to early summer. http://en.wikipedia.org/wiki/Genista_tinctoria
Native from Europe to Sibiria, naturalized in North America.
The dried branches (harvested at flowering time) are used as diuretic… to support the treatment of diseases in which an increased amount of urine is desirable, such as renal gravel or prevention of urinary stones… Active substances are chinolizidin alkaloids like cytisine, methylcytisine and anagyrin; isoflavones such as genistein; tannins and essential oil in small quantities. http://de.wikipedia.org/wiki/F%C3%A4rber-Ginster