Acacia koaia grows as a shrub or small tree up to 9 meters tall, characterized by its gnarled and twisted trunk, without spines. Its foliage transitions from compound (bipinnate) leaves to modified phyllodes of petiolar origin as it matures, featuring extrafloral glands on the leaf rachises. These phyllodes are strongly falcate, ranging from 6 to 12 cm in length and 0.8 to 1 cm in width, with three prominent veins, and are found on both young saplings and mature plants. It displays mimosaceous flowers, about 2 mm long, gathered in heads approximately 8 mm in diameter, supported by peduncles about 1 cm long, and typically appear in axillary racemes or terminal leafy panicles. The flowers have a cream color, with numerous curled stamens that are significantly longer than the corolla. The fruit are flattened, curved pods constricted between the seeds, measuring 10 to 15 cm in length and 0.8 to 1.0 cm in width. The seeds within these pods are oblong and laterally flattened. It thrives in lowland and montane forests across dry and wet habitats at elevations ranging from 300 – 1,800 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.