The ribbonwood – manatu – is that tall, slender tree with the peeling bark and the masses of small white flowers that make it look like it is covered in snow in spring. It grows on riverbanks, forest margins, and damp ground – a pioneer, a coloniser, a tree that thrives in disturbed soil. But there was once a ribbonwood that grew where even manatu could not survive – the deep swamp, the peat bog, the waterlogged lowland where the ground was always wet and the air smelled of rotting vegetation. It was taller, thicker, more massive than any living ribbonwood. Its roots could breathe underwater. Its bark peeled in long, strong strips. It was the swamp sentinel, and it is gone. Adaptation to permanent waterlogging made it special. Most trees drown if their roots are underwater for too long. But the swamp ribbonwood had evolved a solution. Its roots contained specialised tissues – aerenchyma – that transported oxygen from the trunk down into the waterlogged soil. It could survive months of inundation, even thrive in it. It was a tree of the wet, the dark, the places where other trees feared to grow. It built the swamp forest. In a healthy wetland, the trees are the engineers – their roots stabilise the peat, their shade controls the water temperature, their fallen trunks create habitat for fish and eels. The swamp ribbonwood was the dominant tree of these forests, towering above the flax and the raupō, its white flowers a beacon for bees and birds. Its bark was fibrous and strong – Māori used it for cordage, fishing lines, and weaving. Its wood was soft but durable, used for implements and construction. Its fallen leaves fed the aquatic insects. It was the heart of the swamp. It flowered prolifically, producing masses of small white flowers that were pollinated by insects and birds. Its seeds were small and light, dispersed by wind and water. They could germinate in waterlogged soil, sending down roots that searched for oxygen. That strategy worked when the swamps were vast and the water was clean. It failed when the swamps were drained. Swamp drainage and peat extraction destroyed it. When Europeans arrived, they drained the great lowland swamps for farming. They dug ditches, laid pipes, burned the peat. The swamp ribbonwood, which needed permanent waterlogging to outcompete other trees, could not survive on dry land. Its seedlings died. Its roots dried out. Its old trees fell, one by one, with no young trees to replace them. At the same time, the timber was harvested for building and firewood. A 25-metre tree with a straight trunk was valuable. The loggers took the giants, and the swamp could not regenerate. By the 1920s, it was gone. The last trees were probably felled by a farmer clearing a new paddock, or simply rotted in place as the water table dropped. The living ribbonwood survived. Manatu is adaptable, able to grow in a range of conditions. It is the survivor, the coloniser, the tree of the edges. But the giant swamp ribbonwood is extinct. A few waterlogged fragments in a museum drawer, a few pollen grains in a core sample, and the memory of a tree that used to tower over the swamp. We drained its world. Then we wondered why the swamp felt so empty.