However, it's most likely referring to "Ixora coccinea," commonly known as "Jungle Geranium" or "Flame of the Woods."
Here's why:
* Nandivardhanam is a medicinal plant. Ixora coccinea is known for its medicinal properties in Ayurveda.
* Nandivardhanam is a popular flower in Hindu rituals. Ixora coccinea is often used in Hindu religious ceremonies.
While "Nandivardhanam" isn't a widely used English term, "Jungle Geranium" or "Flame of the Woods" are the most accurate English names for the flower you're likely referring to.