. Plant life, considered with special references to form and function. Plant physiology. THE LEA VES. \2- ?a When this flattening is extensive, so that the petiole becomes thin and leaf-like and the blade is wanting, it functions as a foliage leaf (fig. 144). Not infrequent- ly, the petiole is winged, as in the orange. It may be entirely wanting, in which case the blade arises directly from the base, as in most grasses (fig- 137)- 154. 3. The leaf blade.—To this part of the leaf the word '' leaf '' itself is frecjuently ap- plied. In general, the FiG. 140,-Stipules of Poh'^'onum forming a j |-
. Plant life, considered with special references to form and function. Plant physiology. THE LEA VES. \2- ?a When this flattening is extensive, so that the petiole becomes thin and leaf-like and the blade is wanting, it functions as a foliage leaf (fig. 144). Not infrequent- ly, the petiole is winged, as in the orange. It may be entirely wanting, in which case the blade arises directly from the base, as in most grasses (fig- 137)- 154. 3. The leaf blade.—To this part of the leaf the word '' leaf '' itself is frecjuently ap- plied. In general, the FiG. 140,-Stipules of Poh'^'onum forming a j |- \^\^^t is SO hrOadlv sheath. .'. above the sheathing leaf base j-, ot the cut-off leaf J. .y, the stem; ca an axiUan' ^yjiip-ed aS tO be thill and shout. Natural size.—After trank. o flat; but all gradations. Fig. 141.—Leaf of Thlaspi with clasping base Natural size.—After 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, 1858-1910. New York, H. Holt & company
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectplantphysiology
