Lysimachia filifolia NatureServe Explorer Species Reports — NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports — ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.

FWS Digital Media Library — The U.S. Fish and Wildlife Service’s National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.Lysimachia filifolia is a rare species of flowering plant in the Primulaceae known by the common name Wailua River yellow loosestrife. 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.Genus. Lysimachia L. – yellow loosestrife. Species. Lysimachia filifolia Forbes – Wailua River yellow loosestrife. Subordinate Taxa. This plant has no children. Legal Status. Threatened and Endangered Information: This plant is listed by the U.S. federal government or a state.Lysimachia filifolia is a small shrub in the primrose family that reaches 0.5-1.6 ft (15.2-48.8 cm) in height. The linear leaves measure 0.6-2.1 in (1.5-5.3 cm) long, 0.01-0.07 in (0.3-1.7 mm) wide, and are usually alternately arranged.