C. maritimum: stems glabrous, seldom above a foot high, almost woody at the base, the young branches, foliage, and umbels, thick and fleshy; leaves twice or thrice ternate, with few lanceolate linear segments; umbel of 15-20 or more rays, with an involucre of several small linear or lanceolate bracts. - Clefts of rocks by the sea. Fl. August.