. Botany of the living plant. Botany; Plants. ABC Fig. 199. Diagrams of zygomorphic flowers. A, of Aconite (Ranunculaceae). B, of the Laburnum (Leguminosae). C, of Toadflax (Scrophulariaceae). (After Eichler.) halves. Such flowers are called dorsiventral, or zygomorphic, and the Aconite, Laburnum, and Toadflax are examples (Fig. 199). The plane of symmetry is usually the median plane ; but sometimes it is oblique, as in the Horse Chestnut; or transverse, as in Corydalis. Zygomorphy is very common, it occurs in most families, and it is characteristic of some throughout, as in the Orchidaceae, o
. Botany of the living plant. Botany; Plants. ABC Fig. 199. Diagrams of zygomorphic flowers. A, of Aconite (Ranunculaceae). B, of the Laburnum (Leguminosae). C, of Toadflax (Scrophulariaceae). (After Eichler.) halves. Such flowers are called dorsiventral, or zygomorphic, and the Aconite, Laburnum, and Toadflax are examples (Fig. 199). The plane of symmetry is usually the median plane ; but sometimes it is oblique, as in the Horse Chestnut; or transverse, as in Corydalis. Zygomorphy is very common, it occurs in most families, and it is characteristic of some throughout, as in the Orchidaceae, or Labiatae. Its importance lies in relation to the transfer of pollen by animal agency. The most perfect mechanisms for this end are found in zygomorphic flowers. It is a derivative or specialised state, and comparison shows that it has been acquired by modification from the radial state, along many distinct lines of descent. The Biological Specialisation of the Flower. Diversity of floral structure is very fully illustrated in the Angio- sperms. But however varied, or sometimes even extravagant the structure of flowers may appear to be, each flower should, in point. 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 Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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