Eucalyptus macrandra, commonly known as long-flowered marlock,[2] river yate[3] or twet,[4] is a species of mallee or small tree that is endemic to the south-west of Western Australia.

It has smooth greyish bark, lance-shaped adult leaves, flower buds usually in groups of fifteen, pale yellow flowers and elongated cup-shaped to bell-shaped fruits.Eucalyptus macrandra is a mallee, sometimes a small tree, that typically grows to a height of 2 to 8 metres (7 to 26 ft) and forms a lignotuber.

The fruit is a woody, elongated cup-shaped to bell-shaped capsule 6–10 mm (0.24–0.39 in) long wide with the valves at about rim level.

[10] Long-flowered marlock is found in a variety of soil types in areas north of Albany and favours river plains or depressions.

[2] Eucalyptus macrandra is easily grown from seed, but requires good drainage and a dry, frost-free climate.