ae. Cynapium: annual; stems erect, glabrous, leafy, 1-2 feet high, with forked branches, emitting a nauseous smell when rubbed; leaves twice or thrice pinnate, the segments ovate-lanceolate, more or less deeply cut into narrow lobes; umbels on long peduncles, either terminal or opposite to the leaves, of 8-12 rays, usually without general involucres; partial involucres of 2-3 long linear bracts, towards the outside of the umbels, and turned downwards. - A common weed in fields and gardens. Fl. July, August.