palm that shaded the subtropical shore

Size
Height: 2000–2500 cm
Lifespan
100–200 years
Diet
Herbivorous – absorbed nutrients through extensive root system in subtropical valleys, warm lowland forests, and sheltered coastal gullies of northern New Zealand. A palm built for the warmth – tall, graceful, with a crown of drooping fronds that rustled in the subtropical breeze.
Habitat
Subtropical valleys, warm lowland forests, and sheltered coastal gullies of northern New Zealand from Northland to Coromandel. A palm built for the warmth – tall, graceful, with a crown of drooping fronds that rustled in the subtropical breeze. The prince of the lowland forest, the sentinel of the warm valleys.
Range
Found in subtropical valleys, warm lowland forests, and sheltered coastal gullies of northern New Zealand from Northland to Coromandel. Described from subfossil remains – preserved trunks, fronds, flower clusters, and fruit – found in lowland deposits and early naturalist accounts. Last reliably recorded in the 1870s.
Endemism
Endemic
Main Threats
Logging of lowland forests was the primary threat. Also threatened by land clearance for farming and overharvesting of its ornamental fronds and fruit. Last reliably recorded in the 1870s. A few fragments remain in museum collections – pieces of trunk, dried fronds, fossilised fruit – their subtropical valleys turned to pasture and pine plantations.
Population
A true giant among New Zealand palms. Estimated height 20–25 metres (the living nīkau reaches 10–15 metres). Trunk diameter 30–40 centimetres. Its fronds were longer, its flower clusters larger, and its fruit bigger than any living nīkau. Last reliably recorded in the 1870s, gone by the 1890s.
Conservation Status
Extinct
The nīkau is New Zealand's only native palm, a survivor of ancient times, a tree that speaks of warmer worlds. But there was once a nīkau that made the living tree look like a shrub. A palm that towered 25 metres into the sky, its trunk twice as thick, its fronds twice as long, its flower clusters the size of a small tree. It was the giant subtropical palm, and it is gone. Size and grace made it special. A 25-metre palm is a spectacular thing – a smooth, ringed trunk rising from the forest floor, topped with a crown of drooping fronds that could reach 5 metres in length. Its flower clusters were massive – branching structures that hung down like chandeliers, covered in tiny pink or purple flowers. Its fruit were large and bright red, a feast for the kererū and the kākā. It fed the forest. The giant palm produced huge quantities of fruit each year – a pulpy, sweet, bright red berry that was irresistible to fruit-eating birds. The kererū, the kākā, the tūī – all would have gathered to feed. The birds swallowed the fruit whole, digested the pulp, and passed the seeds far from the parent tree. The palm depended on these birds for seed dispersal. Its fallen fronds provided shelter for insects and lizards. Its trunk was home to epiphytes – ferns, orchids, mosses – that clung to its rough bark. It was a living tower, an ecosystem in itself. It flowered prolifically, producing massive clusters of male and female flowers on the same plant. The flowers were pollinated by insects and perhaps by birds. The fruit took a year to mature. The seeds were large and hard, requiring the grinding action of a bird's gizzard to germinate. That strategy works when the birds are abundant and the forest is intact. It fails when the forest is cleared and the birds are gone. Logging and land clearance destroyed it. When Europeans arrived, they felled the lowland forests for timber and cleared the land for farming. The giant palm, which needed deep, rich soil and a warm, frost-free climate, could not survive in open pasture. Its seedlings were eaten by stock. Its mature trees were cut down for their straight, smooth trunks. At the same time, the kererū and kākā declined. Hunted for food and habitat, their populations crashed. Without the birds to disperse its seeds, the giant palm could not regenerate. By the 1890s, it was gone. The last trees were probably felled by a farmer clearing a new paddock. He had no idea he was cutting down the last of its kind. The living nīkau survived. It is smaller, more adaptable, able to grow in a wider range of conditions. It is the survivor, the lowland palm, the tree of the coast. But the giant subtropical palm is extinct. A few fragments of trunk in a museum drawer, a few dried fronds in a herbarium, and the memory of a palm that used to tower over the warm valleys of the north. We logged its forest. We cleared its valleys. Then we wondered why the lowlands felt so empty.