. Textbook of botany. Botany. Fig. 144. — Venus' fly-trap {Dionma mnscipiila). A, a plant, some of whose leaves are open and some closed as the result of stimulation by an insect; B, a single leaf; C, a cross section of the upper part of a leaf, closed. After Kerner. an insect that has touched any of the sensitive hairs on the upper surface of the leaf. 253. Arrangement of Leaves. — A plant like the lilac or the horse-chestnut, whose leaves are borne in pairs at the nodes of the stem or branch, is said to have opposite leaves. In such plants, very commonly, though not always, the leaves of one
. Textbook of botany. Botany. Fig. 144. — Venus' fly-trap {Dionma mnscipiila). A, a plant, some of whose leaves are open and some closed as the result of stimulation by an insect; B, a single leaf; C, a cross section of the upper part of a leaf, closed. After Kerner. an insect that has touched any of the sensitive hairs on the upper surface of the leaf. 253. Arrangement of Leaves. — A plant like the lilac or the horse-chestnut, whose leaves are borne in pairs at the nodes of the stem or branch, is said to have opposite leaves. In such plants, very commonly, though not always, the leaves of one pair grow in a direction at right angles to that of the next pair above or below; this is the case in the horse-chestnut. Some plants, for example some lilies (Fig. 14s), have their leaves in circles of three, four, or more at each node, instead of in pairs. Yorx many plants, how- ever, like the bean and the cucumber, have only one leaf at each node; their leaves are altcrnalc. In an alternate-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Allen, Charles E. (Charles Elmer), b. 1872; Gilbert, Edward Martinius, joint author. Boston, New York [etc. ] D. C. Heath & co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1917
