C. sativum: annual; stems erect, branching, glabrous, 1 - 1 1/2 feet high, emitting a very disagreeable smell when rubbed; lowest leaves once or twice pinnate, with broadly-ovate or cuneate, deeply cut segments, the others more divided, with linear segments; umbels terminal, of 5-8 rays, without general involucre, and only a few small slender bracts to the partial ones; flowers white, the outer petals larger. - A weed of cultivation. Fl. June.