Good Questions: Long Lasting Mystery Plant?

Amanda sent in this tip and question: I found this wonderful green filler for flower arrangements and it long outlasted the flowers. They're still going strong with no wilt after several months. I even went and bought some more because they are perfect for my dark bathrooms and much more budget friendly than flowers. But what are they? No one seems to know.
(Note: Include a pic of your problem and your question gets posted first. Email questions and pics with QUESTIONS in subject line to: sf(at)apartmenttherapy(dot)com)
Can anyone id this plant? We'd love to know...

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