. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 116 HISTOLOGY AND PHYSIOLOGY. consequence. This is illustrated in twining plants and tendrils. The former generally rotate to the left; though the Hop, Honeysuckle, and others, rotate to the right. When they touch an upright object they continue their rotation, and thus twine around a support. Tendrils (Fig. 228) grow straight until they have attained about three-fourths of their size. T(;iey are then sensitive
. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 116 HISTOLOGY AND PHYSIOLOGY. consequence. This is illustrated in twining plants and tendrils. The former generally rotate to the left; though the Hop, Honeysuckle, and others, rotate to the right. When they touch an upright object they continue their rotation, and thus twine around a support. Tendrils (Fig. 228) grow straight until they have attained about three-fourths of their size. T(;iey are then sensitive to contact, and are continually revolving; when they come in contact with any object, a curva- ture takes place, and a number of revo- lutions are performed around the support (Fig. 228, s) ; whether the coils are few or many, they become attached with con- siderable force; that portion between the point of contact and base also coils in a cork-screw manner (in two directions, Fig. 228, I and r, since both ends are attached), and this brings the plant nearer the support. Tendrils which do not find an object to encircle, become abortive and fall off (in the Grape-Vine and Virginia Creeper), or roll up slowly from the apex to the base, and form a spiral (in Cardiospermum), or a helix (in Cucnirhita), then dry up and become Fig. 228. Tendril of Wild Balsam-apple; i, z, 3, the three branches ; ten, ten- dril ; s, support; r, coil to the right; /, coil to the left; I/, petiole of leaf; //, stem of a fruit; f/, braach,_,. 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 Kellerman, William Ashbrook, 1850-1908. Philadelphia, J. E. Potter and Company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1883
