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Kinds.—(1.) Primary, growing from root-end of embryo.

(a.) Simple.—Conical, ; napiform, ; fusiform, .

(b.) Multiple.—Moniliform, necklace-like. Fasciculated, tufted, thick and fleshy. Tubercular, having small tubers. Fibrous, threadlike.

(2.) Secondary, growing from stems.

Underground, starting from stem below ground. Aerial, starting from stem above ground.