In Rubiaceae, a structure formed from reduced leaves and stipules, which are fused to varying degrees to form a structure often resembling a four-lobed tubular (or cuplike) calyx limb;
In an orchid flower, a small cup or circle of bract-like structures outside of the sepals;
In some Compositae/Asteraceae, a subsidiary circle of small bracts outside a row of involucre phyllaries.