Lysimachia lydgatei is a rare species of flowering plant in the family Primulaceae known by the common name Maui yellow loosestrife.[1] It is endemic to Hawaii, where there are only four occurrences remaining on the island of Maui, the total number of plants under 300.[2] It is federally listed as an endangered species of the United States.
This is a shrub growing up to 1.3 meters long and bearing solitary flowers. It grows in moist or wet shrublands on three ridges on West Maui.[2] It is always found alongside its relative, Lysimachia remyi.[3]
The plant is threatened by the invasion of non-native plant species in its habitat.[2]