What Are the Medical Uses of Rumex Acetosella?

Rumex is herbaceous, with many stem leaves. Flowers bisexual or unisexual, pale green, stipitate, perianth 6 deeply fissured, 3 small outwardly curved on the outside, 3 enlarged on the inside to become wings, wing back often having 1 small tumor; stamens 6; ovary 3-sided , Style 3. Enlarged inner perianth piece of nut.