Calamus sedens – Low Rattan
Calamus sedens is a short, non-climbing rattan palm belonging to the genus Calamus, the largest genus in the palm family. It is a solitary species, rarely exceeding 2 meters in height, with stems about 4.5 cm in diameter without leaf sheaths and up to 6 cm with sheaths. The genus Calamus includes over 400 species after merging in 2015 with other rattan genera and is distributed from Africa through Southeast Asia to Australia and the islands of the western Pacific.
In its natural habitat, Calamus sedens is most often found on the lower slopes of hills in dipterocarp forests at elevations up to 1100 meters above sea level. It avoids mountain ridges, except in mountainous areas where ridges capture fog. The greatest species diversity of rattans occurs in the closed tropical forests of Southeast Asia, although they can also be found in other parts of tropical Asia and Africa.
Botanical description and plant appearance
The combination of a short, solitary rattan trunk with leaves without tendrils ending in broad, folded leaflets is highly diagnostic for this species. Mature fruits are round, relatively small, up to 8 mm in diameter, covered with 15-18 vertical rows of light reddish-brown scales. Seeds are round with a sweet sarcotesta; the endosperm is homogeneous. The seedling leaf is bifid with distinctly divergent leaflets.
The inflorescence without a tendril is structurally diverse; the peduncle often reaches 60 cm or more in length. In both male and female plants, the primary bracts exceed and partially surround the entire inflorescence, are light medium-brown in color, armed with spines only at the base, densely scaly on the outside, and shiny dark brown inside. The flowers are small and densely clustered.
Biological cycle and special features
All Calamus species are dioecious and heavily armed with spines. This genus is characterized by pinnate leaves and is dioecious. This is an extremely distinctive and interesting rattan. The fact that many specimens in herbaria are mistakenly identified as Daemonorops suggests that botanists confuse the large inflorescence bracts with those of Daemonorops section Cymbospatha. However, in Calamus sedens, the bracts are large and longitudinally split but do not fall off early and have free tips.
The stems are rarely used for cane production. The etymology of the name "sedens" means "sitting," derived from the Malay name of the species. About 20% of rattan species have economic importance and are traditionally used in Southeast Asia for the production of wicker furniture, baskets, canes, mats, ropes, and other handicrafts. Rattan canes are one of the most valuable non-timber forest products in the world. Some species also have edible fruits and palm hearts.
Temperature tolerance
Calamus sedens belongs to cold hardiness zone 10a, which means it requires temperatures no lower than -1°C to 1°C. This species does not tolerate frost and requires warm, stable tropical conditions year-round. Cultivation requires tropical or warm subtropical conditions with consistently high humidity (60-90%), temperatures consistently above 18°C, and bright, diffused light.
Plant uses
The plant is sometimes harvested from the wild for local use of its shoots. It occurs in Southeast Asia - Thailand and Malaysia. Most rattan palms are ecologically considered lianas due to their climbing properties, unlike other palm species. A few species also have a tree-like or shrubby habit. In ornamental cultivation, this species can serve as an exotic potted plant or as part of a tropical palm collection in warm greenhouses.
Who is this species for
Calamus sedens is intended for experienced palm collectors and tropical exotic plant enthusiasts who can provide stable, warm growing conditions. Due to its requirements for high humidity, warmth, and specific light conditions, this species is suitable for those with tropical greenhouses or advanced home growing systems.
Summary
There are 13 different genera of rattans encompassing about 600 species. Some species in these "rattan genera" have a different habit and do not climb; these are shrubby understory palms; nevertheless, they are closely related to climbing species and are therefore included in the same genera. Calamus sedens represents a unique group of non-climbing rattans that have evolved towards living in the understory of tropical forests. Most palms are inhabitants of tropical forests, where they develop on well-drained, acidic soils in regions with high, though often seasonal, rainfall. Their range includes areas from lowlands to montane and cloud forests up to 1800 meters in elevation.
