I have had mandavilla in the past, mostly in pink; and even tried to bring them indoors ..
... but never had one in yellow until this year.
Yet, these yellow flowers are very familiar to me as I grew up in the tropical climate and consider them as tropical flowers.
This yellow trumpet-shaped flower is also known as Golden Trumpet and Yellow Bell, according to Wikipedia. It belongs in the genus Allamanda and Apocynaceae family, native to South and Central America; but has become naturalized throughout the tropics.
I picked up the plant, climbing on a small trellis in a 3 gallon container in early September. It took a while before I goet to enjoy the flowers in an uplifting, yellow color.
The petals, closed or opened, are absolutely beautiful and the glossy leaves seem to have a yellow sheen to them.
I have brought the plants indoors 3 weeks ago as the weather turned quite cold, especailly in the night time. Fewleaves have fallen, but there are still several flowers blooming and few buds left on the plant. I plan to trim it down and hope that it will survive the winter months. (I do not have a green house, but most of my house plants seem to have acclimated to the 'real' house ).