Philenoptera violacea known also as apple leaf or rain tree, Afrikaans: Appelblaar, Sotho: Mphata, Tsonga: Mohata, Zulu: Isihomohomo, IsiNdebele: Ichithamuzi, Idungamuzi, Iphanda) is a plant species in the legume family (Fabaceae).

This phenomenon is caused by spittle bugs (Ptyelus grossus) that infest the tree and suck the sap.

[2] [3] The rain tree was collected and depicted as Capassa violacea by Johann Klotzsch in 1861 on a field trip to Mozambique.

[4] Homotypic synonyms include Lonchocarpus violaceus by Daniel Olivier, 1872 and Derris violacea by Hermann Harms, 1902.

[5] It is found in the DRC (Katanga), Tanzania, Zambia, NE Namibia, Zimbabwe, South Africa (Limpopo, Mpumalanga and KwaZulu-Natal Provinces), Eswatini and Okavango Delta, Botswana, SE Angola, and Swaziland.