cruel plant: robust twining shrub having racemes of fragrant white or pink flowers with flat spreading terminal petals that trap nocturnal moths and hold them until dawn
vine: a plant with a weak stem that derives support from climbing, twining, or creeping along a surface
transitivity: (logic and mathematics) a relation between three elements such that if it holds between the first and second and it also holds between the second and third it must necessarily hold between the first and third