Listed as either "endangered" or "critically endangered" by the World Conservation Union in 1994, they have attracted international attention and also been the focus of efforts by domestic conservation groups.
根據 IUCN（世界自然保護聯盟）公布的「受威脅等級評估簡表」（1994），這些台灣僅見的水生植物，都已被列入 EN（瀕臨絕種）與 CR（嚴重瀕臨絕種）等級，不僅引發國際關注，同時也是國內保育團體搶救復育的重點標的。