Clermontia samuelii subsp. hanaensis is a terrestrial shrub that grows 1.2–5 meters tall, with light gray or light brown stems branched repeatedly and spread out, featuring a solid pith and white, viscous latex. Its leaves are simple and alternate, with broadly elliptic blades measuring 5–7.5 cm in length and 2.7–4.5 cm in width. The leaves have an acute, acuminate, or cuspidate apex and a cuneate or obtuse base, with lower surfaces that are sparsely pubescent. The flowers are on peduncles 0.4–1 cm long, with 1.2–2.8 cm long pedicels. These flowers are bisexual, epigynous (having the ovary enclosed in the receptacle, with the stamens and other floral parts situated above), zygomorphic (bilaterally symmetric), resupinate, and protandrous. The perianth is 4–5.5 cm long, white tinged with green, and the tube measures 3.2–3.8 cm. The lobes are 1.5–2 cm long and 3–4 mm wide. The stamens are syngenesious and slightly exserted, with purple or magenta, glabrous filaments. It produces numerous tiny, dark brown or black seeds that are minutely foveate-reticulate and shiny. These seeds contain a straight, short, spatulate dicotyledonous embryo embedded in oily endosperm. This subspecies is found in montane rainforests at elevations of 610–1860 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.