Calyx-teeth minute. Fruit nearly round, emarginate at base, glabrous; carpels nearly globose, with very slender inconspicuous ribs and thick corky pericarp; oil-tubes numerous and contiguous about the seed-cavity; seed terete.--Smooth aquatic perennial, with simply pinnate leaves and variously cut leaflets, usually conspicuous involucre and involucels of narrow bracts, and white flowers. (The Latin name of the Water-cress, of Celtic origin.) 1. B. angustifòlia, Koch. Erect, ½--3° high, leaflets 5--9 pairs, linear to oblong or ovate, serrate to cut-toothed, often laciniately lobed, sometimes crenate (½--3´ long); fruit scarcely 1´´ long. (Sium angustifolium, _L_.)--Throughout the U. S. July, Aug. 24. ZÍZIA, Koch. Calyx-teeth prominent. Fruit ovate to oblong, glabrous, with filiform ribs; oil-tubes large and solitary in the broad intervals, and a small one in each rib; stylopodium wanting; seed terete.--Smooth perennials (1--3° high), with mostly Thaspium-like leaves, no involucre, involucels of small bractlets, yellow flowers, and the central fruit of each umbellet sessile. Flowering in early spring in open prairies and upland meadows. (Named for _I. B. Ziz_, a Rhenish botanist.) 1. Z. aùrea, Koch. _Leaves_ (except the uppermost) _2--3-ternate_ the radical very long-petioled; leaflets ovate to lanceolate, sharply serrate; rays 15--25, stout (1--2´ long); _fruit oblong, about 2´´ long_. (Thaspium aureum, var. apterum, _Gray_, Manual.)--Atlantic States, west to Minn. and Tex. Var. Bébbii, Coult. & Rose. A more slender mountain form, with leaflets more coarsely serrate, the radical leaves smaller and more simple; rays 2--8, slender (2--3´ long); fruit oval, 1--1½´´ long.--W. Va. and Va. to Ga. 2. Z. cordàta, DC. Radical leaves mostly long-petioled, _cordate or even rounder, crenately toothed_, very rarely lobed or divided; _stem-leaves simply ternate or quinate_, with the ovate or lanceolate leaflets serrate, incised, or sometimes parted; _fruit ovate, 1½´´ long_. (Thaspium trifoliatum, var. apterum, _Gray_, Manual.)--Same range as the preceding, but extending farther westward. 25. CÀRUM, L. CARAWAY. Calyx-teeth small. Fruit ovate or oblong, glabrous, with filiform or inconspicuous ribs; oil-tubes solitary; stylopodium conical; seed-face plane or nearly so.--Smooth erect slender herbs, with fusiform or tuberous roots, pinnate leaves, involucre and involucels of few to many bracts, and white (or yellowish) flowers. (Name perhaps from the country, _Caria_.) C. CÁRUI, L. (CARAWAY.) Leaves pinnately compound, with filiform divisions.--Naturalized in many places, especially northward. (Nat. from Eu.) C. PETROSELÌNUM, Benth., the common PARSLEY, from Europe, with 3-pinnate leaves, ovate 3-cleft leaflets, and greenish yellow flowers, is occasionally found as an escape from cultivation. (Petroselinum sativum, _Hoffm._) 26. CICÙTA, L. WATER-HEMLOCK.