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Ms. Lyonne will play a woman named Tiffani in the episode, with additional details about her role being kept under wraps.

Not much is known about the two-part episode, set for Sept. 16, with show-runner Jenji Kohan and the cast telling reporters at the Television Critics Association’s summer press tour that the series will not end with another cliffhanger. Unlike the season seven finale, which ended with perhaps the series’ biggest cliffhanger yet after Nancy (Mary-Louise Parker) was shot with a quick cut to black, the finale will tie up many loose ends and feature a memory lane of past characters.

“[Ms. Kohan] managed to bring things together in a really beautiful way,” Ms. Parker said. “She didn’t make it a happily-ever-after thing, but there was hope, and there was some sort of benediction. I cried when I read it. I think the finale is beautifully written, and I hope it lives up to what she wrote.”

“Weeds” airs at 10 p.m. Sundays on Showtime.

• Compiled from Web and wire reports.