Water avens (Geum rivale) belongs to the Rosaceae (the Rose family). It is a perennial herb that is native to Europe. This herb grows in damp meadows, woods and stream-sides, to 2100 m elevation, and can reach 15-45 cm in height. The leaves are pinnate compound with 3-6 pairs of leaflets. The upper leaves are trifoliate compound. The flowers are solitary nodding-bells, cream or pale pink with brownish-purple sepals, and bloom from May to July. The styles are hooked.