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Embryo hooked, annular, or cochleate, the radicular end pointing downward.—Herbs of fresh, or one in brackish, ponds and streams, with jointed mostly rooting stems, and 2-ranked leaves, which are usually alternate or imperfectly opposite; the submersed ones pellucid, the floating ones often dilated and of a firmer texture.

Cochleate, coiled or shaped like a snail-shell.

Cochleate: spirally twisted like a screw or a univalve shell.