Calamus caesius, commonly known as Sega Rattan, is a slender, high-climbing palm native to the humid tropical forests of Southeast Asia, including the Malay Peninsula, Sumatra, Borneo, and Palawan. It is characterized by its long, flexible stems that can reach over 100 meters, its spiny leaf sheaths, and clusters of small, fleshy fruits. Valued for centuries, this rattan species produces high-quality cane that is traditionally harvested for weaving furniture, mats, and baskets. It is also cultivated in agroforestry systems, often interplanted with food crops, to provide a sustainable source of income while helping to protect soil and forest buffers.

While economically valuable, Sega Rattan poses ecological risks if introduced outside its native range. Its climbing, thicket-forming growth can smother native vegetation, and its bird-dispersed seeds facilitate spread into natural areas. There is documented concern in places like Samoa, where intentional introductions have led to naturalization and aggressive seedling spread, threatening native forests and agricultural land. Due to its spines, shade tolerance, and ability to thrive in various soils, it could become difficult to manage if established in sensitive island ecosystems. Therefore, caution is advised regarding its introduction to regions with similar tropical climates.