Herb, a name given to all plants, the stalks or stems of which perish every year, after their seeds have attained to maturity.

Herbs are usually divided into two classes : 1. Those, the roots of which decay together with the stem ; and 2, Those, whose roots vegetate in the- ground for several years.

The former class is subdivided into J. Annuals, or those plants which arrive at- maturity the first year, and entirely perish, immediately after they have shed their such are wheat, rye, bar-ley, etc. 2. Biennials; and 3. Trieminals; namely, such as yield fruits and flowers the second or third year, and then decay: of this nature is the Garden Angelica, and some other plants.

Those herbs which do not decay after they have shed their seeds, belong to the latter class, and are called perennials ; some of them lose their verdure, and continue bare during part of the year, such as colt's-foot, etc. while others re -tain their leaves the whole year, w hence they are called evergreens; such are the holly, fir, etc.

Herbaceous Plants are such as are furnished with succulent stems, or stalks, creeping along theground every year. They are divided into simiiar classes with herbs, and those which merit more particular notice, are treated of in their al-phabetical series.