An annotated checklist of weed flora in Odisha, India

Abstract

This study consolidated our understanding on the weeds of Bhadrak district, Odisha, India based on both bibliographic sources and field studies. A total of 277species of weed taxa belonging to 198 genera and 65 families are reported from the study area. About 95.7% of these weed taxa are distributed across six major superorders; the Lamids and Malvids constitute 43.3% with 60 species each, followed by Commenilids (56 species), Fabids (48 species), Companulids (23 species) and Monocots (18 species). Asteraceae, Poaceae, and Fabaceae are best represented. Forbs are the most represented (50.5%), followed by shrubs (15.2%), climber (11.2%), grasses (10.8%), sedges (6.5%) and legumes (5.8%). Annuals comprised about 57.5% and the remaining are perennials. As per Raunkiaer classification, the therophytes is the most dominant class with 135 plant species (48.7%).The use of weed for different purposes as indicated by local people is also discussed. This study provides a comprehensive and updated checklist of the weed speciesof Bhadrak district which will serve as a tool for conservation of the local biodiversity.
 Bangladesh J. Plant Taxon. 27(1): 85-101, 2020 (June)

Weed Species Composition in Paddy Field of Usur Town, Bade Local Government, Yobe State, Nigeria

“…The result obtained in this study was higher because of the differences in location and size of the study area. The study is not consistent with the works of Panda [10] who obtained two hundred and seventy-seven 277 species belonging to 198 genera and that of Ekeke et al [21] who obtained a total of 322 weeds species belonging to 172 genera and 145 families. This is probably because of the differences in geographical location and soil types.…”

“…This is probably because of the differences in geographical location and soil types. The study also revealed the family that had the highest number of species was 20 Poaceae and this is consistent with the works of Panda [10] who also obtained Poaceae with the highest number of species (29). The study is also consistent with the works of Ekeke et al [21] who obtained the Poaceae family as the highest species composition of 72 species.…”

“…A study has shown that the release of arable land after harvesting the rice leads to the re-growth of weeds, which in turn increases seed banks and buds in the soil and begins to grow in the subsequent crop seasons. The work is consistency with that of Panda [10] who obtained annual weeds species over Perennial species in Odisha, India. The dominance of annuals probably indicates that they grow in disturbed areas and stable environments.…”

“…Weeds have some characteristics, such as short seed dormancy, high seed germination rate, environmental plasticity, high seedling growth and reproductive capacity, short life cycle, self-compatibility, efficient and well-organized methods of seed dispersal, allelopathy and tolerance to abiotic and biotic stresses. Therefore, due to these reasons weeds are becoming dominant all over the world [10] . A weed is a native or introduced (alien) species that has a perceived negative ecological or economic effect on agricultural or natural systems.…”

“…A weed is a native or introduced (alien) species that has a perceived negative ecological or economic effect on agricultural or natural systems. Climatic, edaphic and biotic factors prevailing in each of the agro-ecological regions influence the formation of vegetation in that area [10] .…”