Annona
[5] The plants typically grow in areas where air temperature does not drop below 28 °F (−2 °C), especially Cuba, Jamaica, Central America, India the Philippines and Calabria (southern Italy).The woody trunks have thin bark that has broad and shallow depressions or fissures which join together and are scaly, giving rise to slender, stiff, cylindrical, and tapering shoots with raised pores and naked buds.Those species of Annona which are more morphologically derived, as well as all Rollinia spp., possess reduced floral chambers and attract small beetles such as Nitidulidae or Staphylinidae.[13] The compound annonacin and dozens of other acetogenins contained in the seeds and fruit of some members of Annonaceae such as Annona muricata (soursop) are neurotoxins and seem to be the cause of a Parkinson-like neurodegenerative disease.The only group of people known to be affected by this disease live on the Caribbean island of Guadeloupe and the problem presumably occurs with the consumption of plants containing annonacin.