Tufted biennial to perennial herbs, often with fleshy taproot. Leaves in a basal rosette (cauline leaves usually absent), pinnatisect, linear, lanceolate to deltoid in outline; leaf-sheath conspicuous, occasionally succulent; stipules absent. Inflorescence a simple umbel (rarely compound in O. brevipes), terminal; involucral bracts connate at base, lanceolate, oblanceolate to ovate, shorter than fruit. Flowers bisexual; sepals small to absent; petals oblong to ovate, apex inflexed; nectary conical, continuous with base of styles; carpels 2. Fruit narrow-oblong to ovate, slightly flattened laterally; mericarps prominently 5-ribbed; carpophore bifid or split to base.
About 23 species, in Borneo, Taiwan, New Guinea, Australia, New Zealand and Central and South America; 7 species in Australia, all endemic to south-eastern Australia.
Chung, K.F. (2007). Inclusion of the South Pacific alpine genus Oreomyrrhis (Apiaceae) in Chaerophyllum based on nuclear and chloroplast DNA sequences, Systematic Botany 32(3): 671–681.