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

By Paula J. Rudall

Within the 3rd version of her winning textbook, Paula Rudall offers a entire but succinct creation to the anatomy of flowering vegetation. completely revised and up-to-date all through, the publication covers all features 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 straightforward hand-lens to the electron microscope. various 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 more advantageous knowing of the relationships between flowering crops. This basically written textual content is perfect for college kids learning a variety of classes in botany and plant technology, and can also be a great source for pro and beginner horticulturists.

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G. in Avicennia) or in alternating concentric bands. 9 Alnus glutinosa (Betulaceae), wood, transverse section. Scale ¼ 100 mm. irregularly shaped73. Such anomalous forms are achieved either by the formation of new vascular cambia in unusual positions or by the unusual behaviour of the existing cambium in producing phloem instead of xylem at certain points. 7 Secondary Phloem Secondary phloem is also a product of the vascular cambium in woody species. As in secondary xylem, secondary phloem consists of both axial and radial systems, formed from the fusiform and ray initials respectively.

Primary phloem is formed by the apical meristem and secondary phloem by the vascular cambium. Phloem may develop precociously in regions that require a copious supply of nutrients, such as developing sporogenous tissue. Phloem is a complex tissue that consists of conducting cells (sieve elements) and associated specialized parenchyma cells (companion cells) (Figs. 13); these two closely interdependent cell types are produced from a common parent cell but develop differently. 12 Lilium tigrinum (Liliaceae), transverse section of stem vascular bundle.

Some other species (including many monocots such as species of Asparagales and Araceae) instead possess a dimorphic hypodermal layer immediately below the root epidermis63; this is normally interpreted as the outermost cortical (exodermal) layer but may represent the innermost layer of a multilayered persistent rhizodermis. The hypodermal short cells resemble trichoblasts, and are probably transfusion cells. 5 Root Cortex and Endodermis The cortex is the region between the pericycle and the epidermis, including the innermost layer, the endodermis.

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