what is the scientific name for sireh?

Answer 1

Sireh is actually a concoction that consists of shaved betel nut fragments, lime and cloves wrapped in fresh palm leaves and chewed as one would chew gum. As it is chewed, it forms an aromatic mixture which colors the lips and saliva red and is reputed to produce mild narcotic effects.
Sireh as such dosen't have a scientific name. Perhaps you are wanting the scientific name of the betel nut one of the main ingrediants of sireh. The betel nut or areca nut palm (scientific name Areca catechu).
The betel nut is a product of great cultural and symbolic significance to the Malay, being used in everything from marriage ceremonies and shamanic rituals to cosmetics.

Answer 2

Piper betle L