. The movements and habits of climbing plants. Climbing plants; Plants. 54 LEAF-CLIMBEKS. OiiAP. n. rather long sub-petioles. The main petiole bends a little angularly downwards at each point where a pair of leaflets arises (see fig. 2), and the petiole of the terminal leaflet is bent downwards at right angles; hence the whole petiole, with its rectangularly bent extremity, acts as a hook. This hook, the lateral petioles being directed a little upwards, forms an excellent grappling apparatus, by which the leaves. Fig. 2. A young leaf of Clematis vUicella. • readily become entangled with surrou
. The movements and habits of climbing plants. Climbing plants; Plants. 54 LEAF-CLIMBEKS. OiiAP. n. rather long sub-petioles. The main petiole bends a little angularly downwards at each point where a pair of leaflets arises (see fig. 2), and the petiole of the terminal leaflet is bent downwards at right angles; hence the whole petiole, with its rectangularly bent extremity, acts as a hook. This hook, the lateral petioles being directed a little upwards, forms an excellent grappling apparatus, by which the leaves. Fig. 2. A young leaf of Clematis vUicella. • readily become entangled with surrounding objects. If they catch nothing, the whole petiole ultimately grows straight. The main petiole, the sub-petioles, and the three branches into which each basi-lateral sub-petiole is generally subdivided, are all sensitive. The basal portion of the main petiole, between the stem and the first pair of leaflets, is less sensitive than the remainder; it will, however, clasp a stick. 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 Darwin, Charles, 1809-1882. New York, D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectplants, bookyear1876
