. Outlines of plant life : with special reference to form and function . Botany. io6 OUTLINES OF PLANT may be winged to serve for "foliage, as in Nepenthes (fig. 220). A few plants have their leaves modified so as to serve as traps, which, by their sudden movements, capture small animals (figs. 224, 225, 226). But generally the foliage function is subordinated to the other work, and the leaf takes on peculiar forms, the more important of which are as follows: 131. (i) Tendrils.—The leaf blade alone, or some of Fig. loo.—Portion o( a plant of the dwarf itS branches, Or the petiolc g
. Outlines of plant life : with special reference to form and function . Botany. io6 OUTLINES OF PLANT may be winged to serve for "foliage, as in Nepenthes (fig. 220). A few plants have their leaves modified so as to serve as traps, which, by their sudden movements, capture small animals (figs. 224, 225, 226). But generally the foliage function is subordinated to the other work, and the leaf takes on peculiar forms, the more important of which are as follows: 131. (i) Tendrils.—The leaf blade alone, or some of Fig. loo.—Portion o( a plant of the dwarf itS branches, Or the petiolc garden-nasturtium {Tropizolum minus) The long petiole a, a. a of the leaf I is and blade, may develop as sensitive to contact and has coiled about ,. . , . , the support and its own stem, ji. z, axil- a Cylindrical body, Without lary branch. Natural size.—After Sachs . ... Wings and sensitive, known as a tendril. In the pea, the stipules become very large, and take the function of the reduced blade (fig. 102). In other plants the base may be broadly winged tor the same purpose. 132. (2) Thorns.—The leaves may develop into slender conical and sharp-pointed thorns or spines, either branched or unbranched (fig. 228). Sometimes the stipules alone become thorns, as in locust and acacia (fig. 103). Neither tendrils nor thorns can be distinguished structurally from similar forms of the shoot. 133. (3) Scales.—In buds, on underground stems and on various parts of the aerial stem, are found small, scale-like leaves of various shapes (figs. 63, 64, 67, 71, 89, 90, 198). These scales may represent the sheathing base only; they may be the base with the stipules (fig. 90); or they may represent the leaf base and the blade. The petiole in all. 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 Barnes, Charles Reid,
Size: 1530px × 1632px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1900
