These tropical flowering plants are natives to Madagascar, but a few species are found in Brazil and some parts of Asia. A characteristic feature of kalanchoes is the growth of new cells on the inner sides of the petals, so as to force open the flowers. Such cells are also found on the outer surfaces of the petals, to aid closure of the flowers. # Some species of kalanchoes are said to be toxic for cats. # Kalanchoe blossfeldiana is the most popular and commonly found house-plant among the kalanchoe species.