Plants 20-70 cm tall, hispid. Leaves bipinnate; segments lanceolate, pinnati¬sect. Peduncles sessile or very short. Umbels leaf opposed. Involucral bracts lacking. Rays 2-6, 1-2 cm long. Involucel of linear bractlets. Calyx teeth triangu¬lar. Fruit ovoid, 2-4 mm long, setulose; bristles on outer mericarps straight, scabrid, glochidiate, the inner mericarps with tubercles; styles erect, as long or slightly longer than the stylopodium.