* Segments of the upper leaves few, long and linear.
Gb. fistulosa: stems thick, hollow, erect, 2-3 feet high, slightly branched; radical leaves twice pinnate, with small cuneatc segments divided into 3-5 lobes, those of the stem with long hollow stalks bearing a few pinnate segments with linear lobes; umbels terminal, the central main one with three rays, each supporting numerous sessile fertile flowers, and few or no pedicellate barren ones, while those which terminate the branches have usually five rays, and only pedicellate, barren flowers; partial involucres of a few small narrow bracts, the general one either entirely wanting or reduced to a single bract; fruits in compact globular heads. - Water Dropwort. - Wet meadows and marshes. Fl. July, August.
Ce. pimpinelloides: stems erect, firm, almost solid, 1-2 feet high or more, with a few long branches; leaves much more divided than in the last; the upper ones usually with long, narrow segments, those of the radical ones much shorter and broader, and sometimes very numerous; umbels of 8-15 rather short rays; general involucre of a few small, linear bracts, sometimes wanting, partial ones of several small, linear bracts. - Meadows, pastures, and marshes. Fl. July.
Ce. Lachenalii and oe. silaifolia are closely allied plants found in salt marshes.
** Segments of stem-leaves numerous, broadly wedge-shaped or oblong.
Ce. crocata: stem stout, branched, 3-5 feet high; leaves twice or thrice pinnate, the segments broadly cuneate or rounded, deeply cut into 3-5 lobes; umbels on long, terminal peduncles, with 15-20 rays, the bracts of the involucres small and linear, several in the partial ones, few or none under the general umbel; fruit somewhat corky. - Ditches, and sides of streams. Fl. June, July.
Ce. Phellandrium: stem rooting at the base, erect, elongated and creeping, or floating, the flowering branches erect or ascending; stem-leaves twice or thrice pinnate, with small oblong entire or cuncate, lobed segments; when under water, the lobes are long, narrow, sometimes capillary; umbels on short peduncles, opposite to the leaves or in the forks of the branches, the rays seldom above twelve; partial involucre of small, narrow bracts. - Ditches, ponds, and streams. Fl. July.