The dataset contains plant species occurrences recorded during fieldwork carried from 6th -14th September 2021 in selected sites in Tana River County and boarding areas of Lamu County. The sites were: Maroni, Tuneni Forest, Tana River National Primate Reserve (TRNPR); Mchelelo (TRNPR); Kongolani (TRNPR); Ponge Forest (TRNPR); Makere Forest (TRNPR); Hewani Forest, Gamba; Bandi Forest; Lalafitu Forest, Ndera Conservancy; Witu Forest, Takutaku Block and Mashamasha; Kipini, Majiweni, Forest Block No. 4; Lake Amu; Ngomeni Forest; Lake Shakababo; and Onkolde Forest. The plants species were mainly identified on site to species level and documented as site records. However, in a few cases, voucher specimens were collected for confirmation and preservation at the East African Herbarium (EA), National Museums of Kenya, Nairobi. Geo-references were taken on site using a Garmin GPSMAP64s.