Allamandas are native to the Americas, where they are distributed from Mexico to Argentine. Some species are familiar as ornamental plants cultivated for their large, colorful flowers. Most species produce yellow flowers. The genus name Allamanda honors the Swiss botanist and physician names Mr Federic Louis Allmand. Huish bestnya kalau flora fauna dinamakan sempena nama kita ya..boleh mintak royalti gitu!
Allamanda species have been used in systems of traditional medicine for various purposes. For instant to treat liver tumors, jaundice and malaria. In analyses, some species even have shown some activity against carcinoma cells, pathogenic fungi and HIV. Wow, never knew this interesting fact before!. In my hometown in Songkhla, no one bothers this plant.
In the wild, allamandas grow along riverbanks and other open, sunny areas with adequate rainfall and perpetually moist substrate. The plants do not tolerate shade or salty or alkaline soils, and they are sensitive to frost. They grow rapidly, sometimes spreading 3 meters per year. They can be propagated from cuttings.
But, they can be invasive! In my farm @ Fraser's Hill, they grew very bushy!