An extensive floristic survey was done to annotate Phyllanthus of southwestern 7Bangladesh from 2015 to 2018. In total, 2189 individuals of Phyllanthus were counted and 8 identified as eight different species (five herbs, two trees and a shrub). All species were examined 9 following both morphological and anatomical methods, based on taxonomic notes. The listed 10 species were Phyllanthus acidus, Phyllanthus amarus, Phyllanthus debilis, Phyllanthus emblica, 11 Phyllanthus niruri, Phyllanthus urinaria, Phyllanthus reticulatus and Phyllanthus virgatus. 12 Among them, Phyllanthus amarus and Phyllanthus debilis were listed for the first time from 13 Bangladesh during this study period. 14 15 Phyllanthus debilis 16 58 Standard herbarium technique (Hyland 1972; Rahman et al. 2013) was used to collect the 59 herbarium specimen for analysis. Live specimens were photographed by Celestron handheld 60 digital microscope and Nikon-3200D camera with Nikkor 18-55mm AF-S DX, Nikkor 55-300mm 61 AF-S DX and Micro-Nikkor 105 mm FX AF lenses. We recorded GPS quadrate for all surveyed 62 sites with a GPS device (Garmin GPSMAP 76CSx). Image J (1.52a) was used to record 63 morphological measurements and image analysis. Herbarium sheets were prepared and deposited 64to FWT herbarium to conserve for future use. We did not collect any endangered angiosperm or 65 sample from any protected areas, hence no permission was required for the collections. Collected 66 specimens were analyzed and identified based on key provided by Hooker (1890), Prain (1904), Result 71 2189 individuals of Phyllanthus were examined and classified into eight different species from 72 southwestern part of Bangladesh. Among these, five were herbs, two trees and a shrubs. Expect 73 Phyllanthus debilis all the species were well distributed throughout the study area. Meanwhile, 74 Phyllanthus niruri, Phyllanthus urinaria, Phyllanthus amarus and Phyllanthus reticulatus were 75 very abundant in the study sites. But Phyllanthus virgatus were found in Jessore-Chuadangha belt 76 and absent in Khulna, Satkhira and Bhagerhat (table 2). Apart from these, Phyllanthus acidus and 77 Phyllanthus emblica could be listed as a plantation species as they were absent at natural habitats. 78 In addition to it, Phyllanthus amarus and Phyllanthus debilis were listed for the first time from 79 Bangladesh at current study. A Monoecious, glabrous, deciduous, small sized tree, up to 15m high; branches stout, leafless, 94 with slender deciduous leafy branchlets at the end; bark brownish. Leaves distichous, alternate, 95 stipulate, stipules lanceolate, 0.8-1 mm; petiolate, 1.5-3mm long, distichous; leaf blade ovate to 96 ovate-lanceolate, 3-8mm long and 1-3.5mm wide, leathery, acute to acuminate at apex, rounded 97 or broadly cuneate at base, lateral veins 7-9 pairs, sometimes indistinct. Flower bisexual, dark 98 reddish, at dense clusters forming slender, glabrous, in interrupted racemes, arising along the stem 99 and branches. Male flowers are minute, red; staminate, stamen 4, free, 2 shorter...