Peucedanum sandwicense, a member of Apiaceae (parsley) family, is a parsley-scented, sprawling herb usually 0.5 to 1 m (20 to 40 in) tall. Hollow stems arise from a short, vertical, perennial stem with several fleshy roots. The compound leaves are generally three-parted with stalkless leaflets, each egg- or lance-shaped and toothed. The larger terminal leaflet is usually one- to three-lobed and 7 to 13 cm (2.8 to 5.1 in) long. The other leaflets have leaf stalks 10 to 50 cm (4 to 20 in) long or are stalkless. Flowers are clustered in a compound umbel of 10 to 20 flowers. The round petals are white and bent inward at the tips. The flat, dry, oval fruits are 10 to 13 mm (0.4 to 0.5 in) long and 5 to 8 mm (0.2 to 0.3 in) wide, splitting in half to release a single flat seed.