Pritchardia munroi is a palm that grows to approximately 4–5 meters in height. Its trunk is about 20 cm in diameter and supports a crown that typically contains fifteen to twenty ascending, spreading, and sometimes drooping leaves. The leaves are simple and organized in a spiral arrangement. Each leaf blade measures about 88 cm from the ligule to the apex, with segments that have long, very acuminate drooping points and long filaments between them. The upper surfaces of the leaves are pale green and glabrous, while the lower surfaces feature scattered small, elongate-elliptic, entire, hyaline lepidia. The veins run parallel. The petioles are about 85 cm long, with the lower surface initially densely covered in brown, wooly hairs and the upper surface sparsely covered in silvery white tomentose, both becoming less pronounced with age. Additionally, the blade’s lower costae (midrib) have broad, long, silky, pale brown, translucent palea on their lower surface. Stipules are absent. The inflorescences are about 52 cm long, shorter than the petioles, and consist of 10–13 cm long panicles with a few 2-partite branches in the lower part and simple floriferous branchlets elsewhere. The rachillae are either erect or twisted, covered throughout with a dirty grayish-brown tomentum, and marked with conspicuously spirally alternate notches for the insertion of the flowers. The flowers themselves are bisexual (perfect) and sessile. The calyx is cupular, shallowly 3-lobed, and prominently nerved or smooth when dry. The corolla comprises three petals that are adnate to the staminal filament tube at the base up to the height of the calyx, with distinct lobes that are valvate in bud and caducous as the flower expands. The stamens are six in number; filaments are flattened, thickish, and connate at the base, forming a tube that equals or exceeds the calyx, with anthers that are dorsifixed and bifid at the base. The fruit is black, glossy, and subglobose, measuring 2–2.2 cm in diameter. The seeds are distinct from the endocarp except at the hilum, shiny, and the endosperm is homogeneous except for a shallow invagination of the seed coat below the raphe. The embryo is lateral, near the base opposite the raphe (longitudinal ridge on the side of certain ovules). It is found in a mesic gulch above Kamalo and near or at Puako’olau on the leeward side of Moloka’i, at an elevation of approximately 610 meters.