Warm house plants are plants that thrive in warm temperatures and can be kept indoors. Achimenes is a genus of flowering plants in the family Gesneriaceae, native to Central America. They are commonly known as 'hot water plants' due to their ability to tolerate high temperatures. Poinsettia is a species of flowering plant native to Mexico and Central America. It is popularly used as a Christmas decoration and is often referred to as the 'Christmas flower'.