Anatomy of flowering plants : an introduction to structure by Paula J. Rudall

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By Paula J. Rudall

Within the 2007 3rd variation of her winning textbook, Paula Rudall presents a finished but succinct creation to the anatomy of flowering crops. completely revised and up-to-date all through, the publication covers all facets of comparative plant constitution and improvement, prepared in a sequence of chapters at the stem, root, leaf, flower, seed and fruit. inner buildings are defined utilizing magnification aids from the straightforward hand-lens to the electron microscope. a number of references to contemporary topical literature are integrated, and new illustrations replicate quite a lot of flowering plant species. The phylogenetic context of plant names has additionally been up to date because of more desirable realizing of the relationships between flowering crops. This essentially written textual content is perfect for college kids learning a variety of classes in botany and plant technological know-how, and can also be a superb source for pro and beginner horticulturists.

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B ¼ bar of scalariform perforation plate, r ¼ ray. Scale ¼ 100 mm. element walls are helically thickened, and in many Fabaceae the pit apertures are surrounded by numerous warty protuberances, termed vesturing19. Perforated ray cells, an unusual feature of some woods, are ray cells that link two vessel elements and themselves resemble and function as vessel elements, with perforation plates corresponding to those of the adjacent vessel elements. However, like other ray cells, perforated ray cells are formed from ray initials rather than from fusiform initials, like vessel elements.

Adventitious roots may also form from callus tissue at the site of a wound. 8 Secondary Growth in Roots In some woody eudicots the thickening and strengthening of the root system is important in supporting the trunk. Most dicot roots possess at least a small amount of secondary thickening (Fig. 5), with the exception of a few herbaceous species such as Ranunculus (Fig. 3). 8). A notable exception is Dracaena, in which a limited region of secondary tissue is formed111. As in the stem, secondary vascular tissues of the root are produced by a vascular cambium.

6 Secondary Xylem Secondary xylem (wood) varies considerably between species. The texture and density of a particular type of wood depend on the size, shape and arrangement of its constituent cells73. Wood is composed of a matrix of cells (Fig. 6), some arranged parallel to the long axis (fibres, vessels and chains of axial parenchyma cells), and others (ray parenchyma cells) forming the wood rays that extend radially from the vascular cambium towards the pith. The precise cellular arrangement in wood is often characteristic of species or genera.

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