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Ramayya, N.
- Studies on the Trichomes of some Compositae I. General Structure
Authors
1 Department of Botany, Osmania University, Hyderabad-A. P., IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 4, No 1-4 (1962), Pagination: 177-188Abstract
Seventy two Compositae belonging to 56 genera representing the thirteen tribes of the family have been investigated in this study, Trichomes are recognised broadly into two categories namely the 'vegetative' and the 'floral' ones. It is the former that have been presently taken up for detailed investigations. In all 35 trichome types are found so far in the family. Of these, 15 have been described by previous workers which the present author has also observed in the species under investigation. Another 13 are the newly established types by the author. The remaining 7 represent types which the author has not come across during the present investigations but are described in the literature.The general features of the trichomes in the family are discussed in the light of the present study. The trichomes are shown to exhibit in all four patterns in their structure which provide important evidence in the phylogeny of the trichomes.
- Studies on the Trichomes of some Compositae II. Phylogeny and Classification
Authors
1 Department of Botany, College of Science, Osmania University, Hyderabad-7 (A.P.), IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 4, No 1-4 (1962), Pagination: 189-192Abstract
On the basis of the evidences from structural patterns, modes of development and metamorphic variations, the vegetative trichomes of the Compositae are shown to consist of four systems viz., I. Filiform System II. Macroform System III. M-Multiseriate System and P-Multiseriate System.As Trichomes comprise more than one system, their phylogeny and classification needs to be studied separately within each system.
Evidences from the metamorphic variations and from the trichomes of the hybrids are shown to be of value in tracing the relationships. Netolitzky's (1932) phyletic dicta-which in general conform to the evolutionary principle 'simple to complex'-are considered to be useful in recognising the general primitive or advanced condition of a trichome within its system.
Within the systems, trichomes are shown, to be classifiable into the three morphological groups 'Papillae', 'Scales' and 'Hairs' adopted by Cowan (1950) for the trichomes in Rhododendron.
Studies on the trichomes of vascular plants in general are emphasized so that information could be available on the total number of their systems and distribution which will not only be of morphological value but also bf taxonomic significance.
- Systematics, Distribution and Anatomy of the Two Indian Species of the Genus Elatine L.
Authors
1 Osmania University, Hyderabad, IN