Eucalyptus delegatensis, commonly known as alpine ash, gum-topped stringybark, white-top[3] and in Victoria as woollybutt,[4] is a species of tree that is endemic to southeastern Australia.

It has a straight trunk with rough, fibrous to stringy bark on the lower half of the trunk, smooth white bark above, lance-shaped to curved adult leaves, flower buds in groups of between seven and fifteen, white flowers and barrel-shaped or hemispherical fruit.Eucalyptus delegatensis is a tree that typically grows to a height of 40–50 m (130–160 ft), sometimes to 90 m (300 ft), and forms a lignotuber.

Mature buds are oval to club-shaped, green to yellow or red, 4–5 mm (0.16–0.20 in) long and wide with a conical or rounded operculum with a small point on the tip.

[3][5][6][7] Eucalyptus delegatensis was first formally described in 1900 by Richard Thomas Baker from a specimen collected by William Baeuerlen, (previously known as Wilhelm Bäuerlen) on "Delegate Mountain".

[3] In 1985 Douglas John Boland described two subspecies and the names have been accepted by the Australian Plant Census: Alpine ash is widespread and often dominant in grassy or wet subalpine forest, in deep fertile soil, often on slopes, and commonly forms pure stands.