Alectryon macrococcus var. macrococcus is a tree species that grows 3–11 meters tall, having reddish-brown branches that are striate, with the youngest branches being yellowish brown and tomentose. The leaves are compound, even-pinnate, and alternate, with blades that are elliptic to elliptic-ovate or elliptic-oblanceolate, usually slightly asymmetrical, and 20–55 cm long. Each leaf has (1)2–5 pairs of leaflets, each 10–28 cm long and 4–12 cm wide, with 1–1.5 cm long petiolules. The leaflets can be opposite or alternate, with acuminate to obtuse apexes and broadly cuneate to rounded bases. The upper surfaces of the leaves are glossy and glabrous, while the lower surfaces are sparsely pubescent or glabrate at maturity. The flowers are in panicles up to 30 cm long, with small pedicels and caducous bracts. The flowers can be either bisexual (perfect) or staminate, featuring a cup-shaped calyx with 4–6 lobes. There are no petals, but the stamens are 6–8 in perfect flowers and 9–13 in staminate flowers. Puberulent filaments and dithecal anthers open longitudinally. The fruit consists of 1(2) subglobose mericarps, each 2.5–7 cm in diameter, with a pericarp that becomes glabrate with age. The seeds are glossy pale brown, with a hard coat and irregular projections at the base that overlaps the scarlet, firm-fleshy aril, ca. 1 mm thick. An irregular sinus is on one side, and the endosperm is absent. It is found in dry to mesic forests between 360–800 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.