29. Oxalidaceae - Sorrel; mostly herbs, rarely trees; often with fleshy tubers or rhizomes; leaves alternate, pinnately or palmately compound, or simple by reduction, lacking stipules; often with acrid taste; flowers perfect, in umbellate inflorescences; sepals 5, separate; petals 5, separate or united at base; stamens 10, outer whorl opposite the petals, monadelphous (filmants fused); fruit usually a loculicidal, elastically explosive capsule, rarely a berry.