The Utricularia dichotoma species complex comprises 8 closely related but genetically clustered subspecies. Jobson and Baleeiro in 2020 distinguished a taxon that is distributed in coastal habitats across south eastern Australia. This taxon is named U. dichotoma subsp. maritima, in reference to its habitat in coastal heathland.
Within the species complex, the features of the bracts and bracteoles are important to distinguish the subspecies. . The bracts of U. dichotoma are all attached at the base of the structure, but differ in the shape of the appendages below and at the point of attachment. The bracts of subsp. maritima are wide near the bottom, reducing upwards to a blunt point. At the base of the bract emerges a short downwards pointing spur that is rounded at the end. I have observed the morphology of the bracts to be somewhat variable, with some specimens only have gibbous bases that lack a spur.
LIke its relatives, the lower corolla lip is skirted and flared. The flowers are purple, except for the palate which features a set of yellow ridges. The flower stalk typically grows up to around 30 cm tall. The leaves are entirely linear or spatulate, depending on environmental conditions. The subspecies grows terrestrially in waterlogged soils.
U. dichotoma subsp. maritima has a broad distribution along the coasts of NSW, Victoria, eastern SA and Tasmania. It is usually found in wetlands amongst heath. The range extends inland where similar habitat is provided (etc the Grampians).