Mountain Trachymene is a perennial, rhizomatous, robust herb, that grows to 10 cm high. Leaves occur in basal rosettes. The lamina is 3-5-lobed to dissected, broad ovate in outline, 0.8-2 cm long and 1-3.5 cm wide. Segments are ovate to cuneate, 0.5-1.8 cm wide, and covered by sparse long hairs.
The petioles are 3-4 cm long, umbels are 10-23 mm in diameter, and 20-50 flowers on 12-35 cm long peduncles arise from the base. Bracts are 10-14 and 2.5-7.5 mm long. Flowers are bisexual or female. Petals are 1.1-1.2 mm long and white. The ovary is 2-locular. The fruit is broad ovate to orbicular, 3-5 mm long, brown; with one or both mericarps maturing. Mericarps are 2.5-3.6 mm wide and are smooth. Flowers appear from December to March with the ripened small fruit allowing for seed dispersal in April.
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