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Chaudhary Charan Singh University (2013)

Study of flora of district meerut in from of digital herbarium database

Shishodia, Jyoti

Titre : Study of flora of district meerut in from of digital herbarium database

Auteur : Shishodia, Jyoti

Université de soutenance : Chaudhary Charan Singh University

Grade : Doctor of Philosophy (PhD) in Botany 2013

The present work embodies a record of the images and plants collected during a period of four and half years after an extensive botanical exploration of Meerut district. Both wild and cultivated species were collected (except garden annuals and hybrids) in flowering and fruiting stages, as far as possible. The specimens were critically examined and identified with the help of available floras and literature. The specimens were matched and confirmed with the authentic specimens of the Herbarium of Botanical Survey of India, Northern Circle, Dehradun.
Families are arranged according to Bentham and Hookers (1862-1883) system of classification. However, at places the suggestions of Hutchinson (1959) and Airy Shaw (1973) are followed for splitting the families with a view to incorporate latest trends. The keys to the genera of each family and to the species of each genus are provided for easy identification. The genera in each family and species in each genus are arranged in alphabetical order for convenience. All efforts have been made to bring the nomenclature up to date.
A concise account of diagnostic characters of all the species is given which is followed by field notes including habitat range, abundance, place of collection, flowering and fruiting period, local names and uses.
The total number of 862 species (including subspecies and varities) have been recorded belonging to 521 genera and 118 families of Angiosperms. Out of these 668 species under 408 genera and 95 families belong to Dicotyledons and 194 species under 113 genera and 23 families belong to Monocotyledons. The ratio of families belonging to Monocotyledons and Dicotyledons is 1 : 4.13 of genera 1 : 3.61 and of species 1 : 3.44. The ratio of genus to species is 1 : 1.65. The family Poaceae with 98 species occupy the first position, Fabaceae with 73 species second and Asteraceae with 60 species the third position. The dominant genus in the area is Cyperus with 24 species followed by Ipomoea 13 species and Cassia with 11 species.

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