Lysimachia lydgatei is a sprawling shrub with 1–1.3 meter long stems, branched and initially covered in a dense layer of rusty tomentose, which eventually becomes glabrate. The leaves are simple and alternate, with elliptic blades measuring 49–70 mm long and 14–22 mm wide. These coriaceous blades feature an acuminate apex, a cuneate base, and entire margins. The upper surfaces of the leaves are appressed rusty pilose, while the lower surfaces are densely rusty tomentose. The veins of the leaves are obscure, and the petioles are 10–16 mm long. The flowers are solitary in the leaf axils, perfect, actinomorphic (radial symmetry), and typically 6–7-merous. The pedicels are 11–35 mm long in fruit and are brown pubescent. The calyx consists of 6 narrowly lanceolate lobes, and the corolla lobes are entire and imbricate. The stamens are as many as and opposite the corolla lobes, with filaments adnate to the corolla tube and dithecal anthers. It produces capsules that are probably broadly ovoid to subglobose, about 6 mm long, and regularly dehiscent by 6–7 valves. It grows on the sides of steep ridges in ‘ōhi‘a dominated lowland mesic shrubland at approximately 1,100 meters.
Bean-shaped (Reniform): Resembling the shape of a kidney or bean.
Square or Oblong: Angular shape with all sides more or less equal or longer than wide.
Triangular: Three-sided shape, broadest below the middle.
Elliptic: Rounded at both ends. shaped like an ellipse or oval.
Ovate or Obovate: egg-shaped, broader at one end.
Linear: Extremely long and narrow, with sides usually parallel.
Round: Appears circular, with length and width roughly the same.
Cardioid (Heart-Shaped): One edge has a prominent double curve into two lobes.
Cylindrical: A cylinder with parallel sides and a circular cross-section.
Discoid: Resembling a disc or plate with two relatively flat surfaces.
Fusiform: Spindle-shaped, tapering at both ends.
Globose: Spherical.
Lenticular: Resembling a lens with two convex surfaces.
Ovoid: Egg-shaped.
Plano-convex: Having a flat ventral (planar) surface and a curved dorsal (convex) surface.
Polygonal: Having more than three flat faces meeting at angles.
Sectoroid: Resembling a segment of an orange with two relatively flat faces and one curved face.
Subglobose/ellipsoid: Inflated shape but less than spherical.
Trigonous: Having three faces that meet at a distinct angle; triangular in cross-section.
Endangered species (E) are species that are so rare they’re in danger of becoming extinct.
Threatened species (T) are species that are likely to become endangered within the foreseeable future throughout all or a significant portion of their range.
Species of Concern (SOC) are species about which there are some concerns regarding status and threats, but insufficient information is available to list the species under the Endangered Species Act (ESA).
Plant Extinction Prevention (PEP) is a state status for rare plants that focuses its efforts on species that have fewer than 50 remaining wild individuals.
Orthodox seeds (desiccation-tolerant): can be dried to an internal seed moisture of less than 12% water and stored at freezing temperatures.
Intermediate seeds (temperature-sensitive) tend to age faster than orthodox seeds and may have only a 5-year lifespan when stored at -20°C. They are recommended for storage at 5°C.
Recalcitrant seeds (desiccation-sensitive): cannot be stored in a conventional freezer as they cannot survive after drying and/or freezing at -20°C. They are recommended for cryopreservation storage.