Anatomy of Flowering Plants: An Introduction to Structure by Paula J. Rudall

By Paula J. Rudall

Within the 3rd variation of her profitable textbook, Paula Rudall presents a finished but succinct advent to the anatomy of flowering vegetation. completely revised and up-to-date all through, the ebook covers all points of comparative plant constitution and improvement, prepared in a chain of chapters at the stem, root, leaf, flower, seed and fruit. inner constructions are defined utilizing magnification aids from the easy hand-lens to the electron microscope. quite a few references to fresh topical literature are incorporated, and new illustrations replicate a variety of flowering plant species. The phylogenetic context of plant names has additionally been up-to-date due to stronger knowing of the relationships between flowering vegetation. This basically written textual content is perfect for college students learning quite a lot of classes in botany and plant technological know-how, and is usually a superb source for pro and beginner horticulturists.

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G. Iris) possess polyarch roots, and the centre of the root is parenchymatous, sometimes becoming lignified in older roots. 7 Initiation of Lateral and Adventitious Roots Lateral roots are branches of the tap root. They are initiated in relatively mature tissues some distance from the apex, often in acropetal sequence; the most recently-formed lateral roots are usually those nearest to the root apical meristem. In angiosperms, lateral roots have a deep-seated (endogenous) origin. Root formation is usually initiated in groups of ‘‘founder cells’’ in the pericycle, often adjacent to the xylem poles.

11 (left) Urtica dioica (Urticaceae), intact tip of stinging hair. Scale ¼ 10 mm. the fluid. Other examples of specialized hair types include water-absorptive leaf scales in many Bromeliaceae, and saltsecreting glands of species of Avicennia60. 8 Ground Tissue Ground tissue, sometimes termed packing tissue, forms the bulk of primary plant tissue and occupies the areas that are not taken up by vascular tissue or cavities. It has a mechanical function, and may be concerned with storage or photosynthesis.

As in secondary xylem, secondary phloem consists of both axial and radial systems, formed from the fusiform and ray initials respectively. Phloem rays are radially continuous with xylem rays, and may be similarly uniseriate or multiseriate, though in transverse section they often appear dilated towards the cortex as a result of cell divisions to accommodate increase in stem thickness (Fig. 11). 10 Shorea resina-nigra (Dipterocarpaceae), wood, transverse section showing vessels (v) and axial secretory canals (sc), r ¼ ray.

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