| Lysimachia filifolia | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Ericales |
| Family: | Primulaceae |
| Genus: | Lysimachia |
| Species: | L. filifolia |
| Binomial name | |
| Lysimachia filifolia C.N.Forbes & Lydgate (1916) | |
Lysimachia filifolia is a rare species of flowering plant in the Primulaceae known by the common name Wailua River yellow loosestrife. [1] It is endemic to Hawaii, where there are two populations on Oahu and one on Kauai. It is a federally listed endangered species of the United States.
This is a small shrub growing up to about half a meter in maximum height. The leaves are very narrow to threadlike and the flowers are reddish purple. [2] The plant grows on the faces of waterfalls in wet forest habitat. [2] [3]
There are about 130 individuals remaining on the island of Oahu, growing at waterfalls in the Koolau Range. [3] There is a single population on Kauai, just discovered in 2008. [3] Another population of plants on Kauai proved to be members of a different species, Lysimachia pendens . [3]
This plant is threatened by the degradation of its habitat by feral pigs and non-native plant species such as mistflower (Ageratina riparia), ti (Cordyline fruticosa), and umbrella tree (Heptapleurum actinophyllum). [3]
