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Crinum thaianum, also called the Thai onion plant or water onion, or Phlap Phueng Than, is an emergent plant species, endemic to the coastal plain of Ranong and Phang Nga Provinces, Thailand. Its natural habitat is to grow along the banks of flowing, medium- to fast-running streams, where its roots and bulb are submerged in the sediment, while its leaves grow long in the current and can access fresh air at the surface. When in bloom, the flower is an umbel of large, showy blossoms above the waterline. These growth habits make it a popular addition for tropical Aquarist, and it is sold in many regions to be used specifically for growth within displays of tropical fish. It also serves the added benefit of oxygenating the water and absorbing ammonia, which is toxic to most aquatic animals. Tropica Aquarium Plants, plant details, Crinum thaianum Onion Plant Aqquarienpflanzenshop, Thailand-Wasserlilile, Crinum thaianum Zwiebel In nature, however, the species is threatened with extinction, and diminishing rapidly, due to habitat destruction.
Only 1% of the species is remaining. Moreover, its found population is highly fragmented and rapidly decreasing. In some habitats, it is already extinct due to excessive collection of their bulbs for commercial purposes, dredging under flooding control schemes, and land use changes. Currently, Crinum thaianum has been listed as Endangered under IUCN Redlist and Thailand Data Redlist. A special management and conservation plan is urgently needed to reduce decrease and extinction.
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