| Bryophyllum pinnatum, Bryophyllum delagoense, Bryophyllum manginii, Kalanchoe millottii, Kalanchoe adelae|
Bryophyllum (from the Greek βρῦον/βρύειν bryon/bryein = sprout, φύλλον phyllon = leaf) is a plant genus of the Crassulaceae family that has sometimes been included within the genus Kalanchoe. There are about forty species in the group, native originally of South Africa, Madagascar, and Asia. The group is notable for vegetatively growing small plantlets on the fringes of the leaves; these eventually drop off and root. These plantlets arise from mitosis of meristematic-type tissue in notches in the leaves.
Nowadays, bryophyllums are naturalised in many parts of the tropics, and deliberately cultivated for their attractiveness or for their interesting reproduction.
Several species of Kalanchoe are economically important for causing cardiotoxic effects in sheep and cattle, and diseases affecting the nervous system and muscles known as krimpsiekte ("shrinking disease") or as cotyledonosis. Bryophyllum pinnatum may have similar chemical components, bufadienolide alkaloids.
There are many hybrids within Bryophyllum, and also hybrids with Kalanchoe such as Kalanchoe × crenatodaigremontiana (B. laxiflorum (as the synonym B. crenatum) × K. daigremontiana) or Houghton's Hybrid (K. daigremontianum × B. delagoense).
Tests conducted in Bangladesh by Dr. Kamrul Alam Khan showed crushed leaves of Bryophyllum daigremontianum (পাথরকুচি) is a good electrolyte and it can be used in a battery to generate electricity. 1 kg of crushed Bryophyllum leaves can produce up to 20 kW of power.
The three most commonly cultivated species are:Bryophyllum daigremontianum: Devil's Backbone or mother-of-thousands. Native of Madagascar; introduced and naturalized in many parts of tropical and subtropical Africa, Asia (Indian Ocean islands), North America (Florida) and South Africa; cultivated in Pakistan, India and Bangladesh for its medicinal properties. In Bangladesh it is known as Patharkuchi Pata.
Bryophyllum pinnatum: Air Plant. Native of Tropical Africa, cultivated or naturalized on many Pacific Islands (Tonga, Hawaii). It is also called the "Goethe Plant" since the famous writer Johann Wolfgang von Goethe — who also was an amateur naturalist of some repute — was "passionately fond" of this plant and liked to give the baby plantlets as gifts to friends who visited his home. He also discussed his air plant at length in the essay that was titled Geschichte meiner botanischen Studien ("History of my botanical studies").
Some other species in this section are:Bryophyllum beauverdii