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Pandanus

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Pandanus is a diverse genus of monocots containing about 578 accepted species. These plants are often referred to as screw palms or screw pines. They are native to the Old World tropics and subtropics. While they look like palms, they are not closely related to palm trees. The genus is the largest within the family Pandanaceae. These plants are of massive cultural and economic importance, especially in the Pacific. In many island areas, they are considered second only to the coconut in importance.

The physical structure of Pandanus is built for survival in challenging environments. The plants vary from small shrubs to medium-sized trees with broad canopies. Their trunks are often stout and wide-branching with visible leaf scars. Many species develop adventitious stilt roots near the base of the stem. These thick roots form a pyramidal tract to provide stability.

Pandanus sp.2
Pandanus sp.2

This support is vital as the plant grows top-heavy with branches, leaves, and heavy fruit. In coastal areas with loose sand, these stilt roots act as anchors against strong winds and salt spray.

Reproduction in Pandanus involves a process called being dioecious. This means that male and female flowers are produced on separate individual plants. Male trees produce long, fragrant flowers surrounded by narrow white bracts. Female trees produce flowers that develop into round fruits. These individual fruits are technically drupes. As they mature, they merge to form a large, globose multiple fruit.

Pandanus simplex is karagumoy
Pandanus simplex is karagumoy

These fruits often resemble pineapples with many prism-like sections. They typically change color from green to bright orange or red as they ripen. Some fruits can remain on the tree for more than 12 months.

Scientists have used fossils and DNA to trace the history of this genus. The oldest credible fossil is Pandanus estellae, a silicified fruit. It was discovered in Queensland, Australia, and dates to the Oligocene epoch. This was approximately 32 to 28 million years ago.

Naturalis Biodiversity Center - L.0939605 - Aken, J. van - Pandanus repens - Artwork
Naturalis Biodiversity Center - L.0939605 - Aken, J. van - Pandanus repens - Artwork

Modern phylogenetic analyses of maternal DNA show the genus is divided into two large groups called Clade I and Clade II. The split between these clades occurred during the early Miocene. Further subdivisions into subclades happened during the Middle Miocene Climatic Optimum.

The distribution of Pandanus is widespread across the Paleotropics. The highest concentration of species is found in Madagascar and Malaysia. These plants inhabit many environments, from sea level to altitudes of 1,300 meters.

Pandanus sp.2
Pandanus sp.2

Clade II species are specifically adapted to more seasonal climates and well-draining soils. These species possess a specialized layer of water storage tissue called hydrenchyma. This tissue helps the plant survive in environments where water is scarce. While animals like elephants, bats, and crabs eat the fruit, most species rely on water for dispersal. The fruit can float, allowing it to reach new islands.

Pandanus provides essential resources for many human cultures. In Southeast and South Asia, the leaves of Pandanus amaryllifolius are used in cooking. Because of their distinct aroma, they are sometimes called the "vanilla of Asia." The leaves contain 2-acetyl-1-pyrroline, which is the same aromatic ingredient found in basmati rice. In the Pacific, the plants are used for housing, clothing, and tools.

Pandanus simplex is karagumoy
Pandanus simplex is karagumoy

Artisans slice mature leaves into fine strips to weave mats, ropes, and baskets. In Hawaii, the dried leaves, known as lauhala, are used for specialized weaving.

The connection between Pandanus and human migration is evident in traditional skills. As Polynesians migrated to colder latitudes like New Zealand, they brought their weaving traditions with them. Even though Pandanus did not grow in New Zealand, they adapted their techniques to native plants like harakeke. This shows how botanical knowledge and cultural practices can evolve alongside new environments. From food staples like the Karuka nuts in New Guinea to religious uses in India, Pandanus remains deeply integrated into global ecosystems and human life.

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File:Pandanus sp.2.jpg
Pandanus sp.2.jpg
File:Naturalis Biodiversity Center - L.0939605 - Aken, J. van - Pandanus repens - Artwork.jpeg
Naturalis Biodiversity Center - L.0939605...
File:Pandanus simplex is karagumoy.jpg
Pandanus simplex is karagumoy.jpg
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