Eucalypus expressa, the Wollemi Stringybark, is a recently discovered Australian tree species. It is a tall forest tree from at least seven populations in sheltered gullies in the sandstone ranges north-west of Sydney. A ROTAP rarity rating of 2KC has been proposed for this species. Usually seen between 20 and 45 metres (66 and 148 ft) tall, it is most closely related to Eucalyptus eugenioides, and was previously known as E. sp. aff. eugenioides (Bees Nest Ridge).