| Family | : Arecaceae |
| Genus | : Calamus |
| Species | : acidus |
| Author | : Becc. |
| Location | : Rajbila Forest Range,, Bandarban Sadar, Bandarban, Bangladesh. |
| Latitude: 22° 20' 23" N; Longitude: 092° 09' 29" E | |
| Accesssion No. | : 63459 |
| Collector | : Hossen, MS Islam, MKR Rahman & MR MiahI |
| Collection Date | : 30-11--0001 |
| Note | : Climbing, growing in clums, stem very large, leaves glabrous, pinnate, inflorescence large, flowers minute, fruits subglobose, from roadside, Rare. |