. Pharmaceutical botany. Botany; Botany, Medical. THE LEAF 31 The leaf of the Tulip Poplar or Liriodendron affords a good example of a Complete Leaf. Sometimes the lamina or blade is attached directly to the stem by its base and is then said to be sessile. If the petiole is present, petiolate. When leaf stipules are absent, the leaf is said to be exstipulate, when present, stipulate. The petiole is seldom cylindrical in form, but usually channelled. Fig. 25.—Stereogram of leaf structure. Part of a veinlet is shown on the right. Intercellular spaces are shaded. {From Steiens.) on the upper side
. Pharmaceutical botany. Botany; Botany, Medical. THE LEAF 31 The leaf of the Tulip Poplar or Liriodendron affords a good example of a Complete Leaf. Sometimes the lamina or blade is attached directly to the stem by its base and is then said to be sessile. If the petiole is present, petiolate. When leaf stipules are absent, the leaf is said to be exstipulate, when present, stipulate. The petiole is seldom cylindrical in form, but usually channelled. Fig. 25.—Stereogram of leaf structure. Part of a veinlet is shown on the right. Intercellular spaces are shaded. {From Steiens.) on the upper side, flattened, or compressed. The stipules are always in pairs and closely resemble the leaf in structure. The blade of the leaf consists of the framework, made up of branching vessels of the petiole, which are woody tubes pervading the soft tissue called mesophyll, or leaf parenchyme, and serve not only as supports but as veins to conduct nutritive fluids. Veins are absent in simple leaves such as many of the Mosses. Leaf Venation.—Furcate or Forked Venation is characteristic of many 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 Youngken, Heber W. (Heber Wilkinson), 1885-1963; Stewart, Francis Edward, 1853-1941. Philadelphia, P. Blakiston's son & co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbo, booksubjectbotany
