Lysimachia pendens is a rare species of flowering plant in the family Primulaceae known by the common name broad-leaf yellow loosestrife.

[4] This plant occurs at one location at the headwaters of the north fork of the Wailua River of Kauai, where it grows alongside the newly described Lysimachia iniki.

[3] This shrub has hanging branches, the new growth covered in tan hairs.

The lance-shaped leaves are closely spaced on the branches and measure roughly 2 to 4 centimeters long by 2 to 4 millimeters wide.

The flowers have green or red-tinged sepals and red petals each just under a centimeter in length.