Apium L.
Umbels compound, us. lf-opposed, often subterminal; involucral bracts and bracteoles few to 0; calyx-teeth 0 or minute; petals white, ovate, acute, ± inflexed. Fr. subovoid, laterally compressed; commissure narrow; mericarps distinctly, obtusely 5-ribbed; vittae large, in furrows. Annual to perennial glab. herbs with compound lvs. Widely distributed genus of some 50 spp.