Second corpse flower 'Barbara' in bloom at Pennsylvania garden

May 12 (UPI) -- A rare corpse flower has bloomed at the Phipps Conservatory and Botanical Gardens in Pennsylvania after four years.

The Pittsburgh conservatory shared a photo of "Barbara" the corpse flower that began to bloom on Friday morning and is expected to release a pungent smell for 12 to 48 hours.

"It's happening! Barbara the Corpse Flower has begun her bloom," the conservatory said. "Though her stench isn't as strong as her big brother Romero's, her bloom is still a unique sight to see."

Barbara is the "little sister" of the conservatory's other corpse flower, Romero, which bloomed in 2013.

The two rare plants are named after filmmaker George A. Romero and the character Barbara from his 1968 film Night of the Living Dead.

"They're coming to SNIFF you, Barbara!" The conservancy wrote in reference to the film.

Barbra was acquired from the University of Pittsburgh in 2012 and grew to a height of 46 inches before blooming.

The corpse flower, also known by its scientific name Amorphophallus titanum, is one of the rarest and largest plants in the world. The unique plants only flower every three to seven years.