. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 186 SYSTEMATIC BOTANY. be split down one side and spread out into a plane, an appearance approximating more or less that in the accom- panying diagram (Fig. 298) will be presented. The distribution of the bundles or midrib and veins in the leaves is such as to form a distinct net-work; and the leaves of the Dicotyledones, or Dieotyls, are, therefore, said to be reticulate, or netted-veined. 191. The epidermis o
. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 186 SYSTEMATIC BOTANY. be split down one side and spread out into a plane, an appearance approximating more or less that in the accom- panying diagram (Fig. 298) will be presented. The distribution of the bundles or midrib and veins in the leaves is such as to form a distinct net-work; and the leaves of the Dicotyledones, or Dieotyls, are, therefore, said to be reticulate, or netted-veined. 191. The epidermis of young shrubby or arboreous plants is later replaced by cork. This may develop in a continuous layer, so as to form a periderm; or corky plates or layers may arise, sit- uated, more or less deeply, in the cortical tissue. That external to these corky layers looses its vital- ity, and a thick bark may appear, consisting of this firm, dry tissue, and the phloem, or bast, which lies \ immediately below. This, in the outer exposed part, is constantly peeling or falling off, or being worn ofi" by weathering; but remains a constant thickness, due to the fact that it is ever replen- ished within by the cambium. The flowers are generally four or five-parted ; that is, each floral whorl contains four or five members. The embryo and germination of a Dicotyl is shown in Fig. 277. The sub-class is very large, embracing all of our forest trees except the Coniferce (Pines, Firs, etc.), and divisible into three groups, namely, Apetalae, GamopetalcB, and Polypetalce or Choripetaloe. Fig. 298. Diagram, showing the course of the fibro-vascular bundles in an exoge- nous stem (of Stachys); tlic figures indicate the position of the 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, 1850-1
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1883
