Forested (palustrine) wetlands are vital ecosystems that provide habitat for flora and fauna, sequester carbon, and filter runoff. Despite this, they are underrepresented in wetland studies. The Fan Palm (Licuala ramsayi) dominated lowland swamp forests of North Queensland are endangered ecosystems. The remaining fragments total ~1000 ha, of which over half are located in Djiru National Park in Mission Beach, North Queensland, Australia. While species lists for Djiru National Park are available, these do not differentiate species that are specific to the Licuala Fan Palm swamp forest. Moreover, the non-vascular plant flora is poorly studied and merits thorough surveying. To address this, we conducted a vegetation study at the Licuala Day Use Area in Mission Beach to describe the structure and to evaluate the botanical diversity of this forest. The palm swamp forest contained an estimated 1733 stems ≥ 5 cm at breast height per hectare, with L. ramsayi being hyperdominant and comprising 56% of all stems. Despite the dominance of L. ramsayi, our plant surveys revealed a highly diverse flora, with 238 species of vascular plants (182 genera, 80 families) comprising 109 trees, 57 herbs, 39 vines, 21 shrubs, and 12 epiphytes. Of the observed vascular plant species, 17 were wetland indicators, 13 had a ‘special least concern’ listing, and one was listed as endangered. Our nonvascular plants survey, which represents the first systematic survey of its kind in lowland forest of the region, also revealed a rich diversity of nonvascular flora, with 40 species of mosses and liverworts from 25 genera and 13 families. Our study highlights the remarkable ecological value of Licuala Fan Palm swamp forests and justifies the need for increased public awareness and further protection of this ecosystem throughout its broader distribution in the Australian Wet Tropics.