Here's why:
* Dahlias are a New World plant: They originated in Mexico and were introduced to the Old World much later.
* Sanskrit focused on native flora: The Sanskrit language developed alongside the flora of the Indian subcontinent. It wouldn't have a specific term for a plant introduced from the Americas.
However, you could describe a Dahlia using Sanskrit terms:
* "Karpūra" (कर्पूर): This word means "camphor" and could be used to describe the white Dahlia variety with a camphoraceous scent.
* "Pushpa" (पुष्प): This simply means "flower."
* "Gandha" (गंध): This means "scent" and could be combined with other words to describe the fragrance of the Dahlia, such as "Gandha-Yukta" (गंध-युक्त) meaning "having a scent."
Ultimately, the best way to describe a Dahlia in Sanskrit would be to use a combination of words to convey its characteristics.