''Lysimachia lydgatei'' is a rare species of flowering plant in the family Primulaceae known by the common name Maui yellow loosestrife.USDA Plants Profile
/ref> It is endemic to Hawaii, where there are only four occurrences remaining on the island of

Maui The island of Maui (; Hawaiian: ) is the second-largest of the islands of the state of Hawaii at 727.2 square miles (1,883 km2) and is the 17th largest island in the United States. Maui is the largest of Maui County's four islands, which ...

, the total number of plants under 300.''Lysimachia lydgatei''.
The Nature Conservancy. It is federally listed as an

endangered species An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and inv ...

of the United States. This is a

shrub A shrub (often also called a bush) is a small-to-medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees ...

growing up to 1.3 meters long and bearing solitary flowers. It grows in moist or wet shrublands on three ridges on West Maui. It is always found alongside its relative, ''

Lysimachia remyi ''Lysimachia'' () is a genus consisting of 193 accepted species of flowering plants traditionally classified in the family Primulaceae. Based on a molecular phylogenetic study it was transferred to the family Myrsinaceae, before this family w ...

''.Marr, K. L and B. A. Bohm. (1997)
A taxonomic revision of the endemic Hawaiian ''Lysimachia'' (Primulaceae) including three new species.
''Pac Sci'' 51(3) 254-87. The plant is threatened by the invasion of non-native plant species in its habitat.

References

lydgatei Endemic flora of Hawaii Biota of Maui {{Primulaceae-stub