Slippery Elm
Slippery Elm. Ben Ferguson. Slippery Elm. Slippery Elm, Ulmus rubra Muhl ., is sometimes called red elm, gray elm, and soft elm. . Classification. Kingdom – Plantae (Plants) Subkingdom – Tracheobionta (Vascular plants) Superdivision – Spermatophyta (Seed plants)
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