Celastrus orbiculatus is very common in the state parks in Maryland. I also find seedlings often in my garden under shrubs. Birds apparently drop the seeds. ID of seedlings can be confirmed by the bright orange roots.
Don't ever collect and use berries for decor in your yard, or you'll likely see seedlings later.

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This horrible twining woody vine (liana) from East Asia is very invasive and rampant growing. It often kills small trees by girdling the trunks and makes itself into quite a mess wrapping around everything. Its leaves are rounded and it bears its flowers and fruit laterally, not terminally like the better American species. It can get over 40 feet long and can produce rather large vine trunks up to about a foot wide. Fortunately, the wood is very soft and it is easy to cut down. It infests open and pioneer woods being one of the ugly, messy invasive plants ruining the appearance of such forest with other invasive woody plants as Multiflora Rose, Amur Honeysuckle, wild Privets, Autumnolive, and Japanese Honeysuckle Vine. It should be exterminated from North America. (The American Bittersweet has narrower, more elongated leaves, bears flowers and fruit terminally, and usually grows less than 20 feet long.)

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