Charpentiera tomentosa var. maakuaensis is a slender or robust tree species that can grow 6–12 meters tall, with new growth that is densely brown and tomentose. The stems measure 1.75–6 mm in diameter directly below the apex, with internodes up to 12 mm long. Apical buds appear lateral, often overtopped by leaves. The leaves are simple and alternate, with blades that are obovate to elliptic in shape. The apex is acute to rounded and often retuse (having the apex rounded or obtuse with a slight notch), while the base ranges from acute to rounded. The surfaces of the leaves can be either glabrous or pubescent, and the margins are entire. There are 10–20 pairs of lateral veins with strongly and prominently developed marginal ribs. The petioles are 1–11 cm long, and the plant lacks stipules. The flowers are arranged in single axillary panicles, which are 1–2 branched, either reddish brown pubescent or glabrous. The panicles measure 13–50 cm long and are often compound, with 8–25 primary branches that are 5–20 cm long. A bract subtends each branch, and the peduncles measure 2–10 cm long. The gynodioecious plant consists of bisexual (perfect)-flowered and female plants in each population. Several to 20–30 flowers per branch, with internodes between individual flowers measuring 0.8–11 mm long. The calyx comprises five distinct, imbricate, subequal sepals 1.5–2.5 mm long and 3–5-veined. The corolla (petals) is absent. There are five stamens and staminodes, with filaments forming a short, membranous tube, and the anthers are exserted at anthesis. The ovary is superior, globose or urceolate (pitcher-shaped), 1.5–2 mm long, with an absent or concise style and two straight or recurved stigmas nearly as long as the ovary, with glands on the inner surface. The fruit is an indehiscent utricle; the seeds are black, shiny, lenticular, and approximately 1.5 mm long. It is found in mesic forests at elevations ranging from 110-770 meters.