Yengo Eucalyptus expressa, commonly known as the Wollemi stringybark, is a recently discovered Australian tree species.

Eucalyptus expressa is a tree that typically grows to a height of 20–45 m (66–148 ft) and has rough, fibrous stringybark on the trunk, and branches wider than 30–50 mm (1.2–2.0 in).

This species is similar to E. eugenioides but differs in its tall habit, scalloped leaf edges and conspicuously protruding valves in the fruit.

[2][3] Eucalyptus expressa was first formally described in 2012 by Stephen Bell and Dean Nicolle from a specimen alongside the Putty Road near Bulga and the description was published in the journal Telopea.

[2][5][6][7][8] The Wollemi stringybark is a tall forest tree from at least seven populations in sheltered gullies in the sandstone ranges north-west of Sydney.