Polyscias bisattenuata is a tree that typically reaches 2 to 4 meters, notable for the presence of secretory canals in most parts. The leaves of this species are compound, consisting of 5 or 7 leaflets arranged alternately along the stem. Each leaf blade extends 2–2.5 decimeters in length, with leaflets fusiform in outline, measuring 6–9 cm long and 2.5–4.5 cm wide, showcasing a unique attenuate form at both ends, providing a distinctive appearance. The petiolules are relatively long, reaching up to 3.5 cm, which supports the leaflets and contributes to the overall leaf architecture. The margins of the leaflets are entirely smooth, with petioles stretching 6–7 cm in length, enhancing the structural elegance of the foliage. Stipules are either absent or rudimentary, reflecting a simplified leaf base structure. The inflorescence resembles that of Polyscias waialealae, with a single observed peduncle measuring 8.5 cm long. Secondary branches extend 3.5–4 cm long, hosting about 4–5 flowers each, supported by pedicels approximately 1.5–1.8 cm long. The flowers are bisexual and actinomorphic (radially symmetric), often appearing terminal but may seem lateral due to the plant’s growth pattern. The calyx, transitioning to a more or less cylindrical shape at anthesis, measures about 7–8 mm tall and 4–5 mm thick, presenting a 4- or 5-angled aspect. Petals number 6, pink in color, forming a hemispheric-conic shape upon shedding, measuring about 5.5 mm in height and slightly broader. It has approximately 12–19 stamens, an inferior ovary, (6–)8–24-carpellate, and is topped by a disk that matures into a hollow, conical stylopodium, 1–3 mm in height, adorned with a rim of stigmatic bulges. The fruits are drupes, containing a single seed per pyrene with a tiny embryo. It is found in open shrubland/herbland, favoring steep slopes, ridges, and disturbed lowland wet forests between 420–710 meters.