depression, structure, hollow, shape, depressions, cavity, structures, form, nest, flowers, valley, base, nests, suckers, receptacle, device, calyx, hollows, cavities, appearance, cusps, indentations, flower, socket, leaves, expansion, extensions, indusia, forms, configuration, fashion, surface, portion, acetabulum, blossoms, shapes, involucre, indentation, projections, arrangement, basin, end, receptacles, concavity, bodies, breasts, spread, container, divisions, objects, outgrowth, attachment, hydrotheca, division, excavations, manner, sheath, cluster, object, holes, crusts, occluder, vessel, formations, destruction, bracts, clinandrum, bowman, valves, shell, organs, bowl, sucker, skeleton, disk, membrane, pocket, capsule, bit, valleys, top, invagination, sac, waves, notch