The analyzed plant groups include numerous species with various economic and ecological roles. The Asparagaceae family includes 25 useful species, predominantly ornamental, but also with cosmetic, medicinal, culinary, or honey-producing uses. Seven species are toxic, many of which have been studied for medicinal purposes. The Asphodelaceae family is represented by a single rare species. The Juncaceae family includes 14 species with few economic uses but important for ecology (phytoremediation, restoration, bioindicators, soil protection). The Juncaginaceae family has two toxic species, used ecologically for soil cover and phytoremediation. The Lemnaceae family includes 5 species with important roles in the ecological and rural economy, one of which is vulnerable. The Liliaceae family includes 14 ornamental species, most of which are endangered in their natural habitat. The Melanthyaceae family contains three highly toxic species. The Najadaceae family has two aquatic species that are not used by Romanians. The Orchidaceae family is relatively diverse, but most species are endangered. The Potamogetonaceae family includes 11 species, important for phytoremediation and bioindication of environmental quality. The families Ruppiaceae, Sparganiaceae, Zannichelliaceae, and Zosteraceae each include 1–2 species used mainly for ecological restoration or phytoremediation. Scheuchzeriaceae has only one toxic species. The family Tofieldiaceae includes one species with ornamental value. The Typhaceae family includes 5 species whose uses have been partially abandoned. Overall, the families presented include species with a wide variety of uses—ornamental, medicinal, culinary, ecological—but also with varying degrees of vulnerability, many of which are already threatened and require conservation measures.