twinflower, (Linnaea borealis), evergreen, creeping shrub of the family Caprifoliaceae, native to moist pinelands or cold bogs in northern regions of both hemispheres. It is named for the paired, nodding, bell-like white or pink flowers borne above a mat of small, roundish leaves.
The fragrant flowers have five green sepals, five petals, and four stamens in two pairs of different length. The americana variety has more tubular flowers, and the longiflora variety has larger leaves and corolla.