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Parts.— n, Node, part to which the leaf is fastened.

i, Internode, portion between nodes.

a, Axil, the angle between leaf and stem, upper side.

Class.—Exogenous, outside-growing (Maple, Elm).

Endogenous, inside-growing (Corn-stalk, Timothy).

Situation.—(1.) Above ground, usually leaf-bearing.

(2.) Under ground, scale-bearing.