Population status and conservation requirement of some endangered plants growing in Dayalbagh Educational Institute, Agra.
The study area is rich in plant diversity but there is an urgent need of conservation. Some rare and endangered plants are still found abundantly in the region, but without protection these plants may become endangered in the near future. Endangered plant species have been categorized by the IUCN (International union for conservation of nature) as the ones likely to become extinct. When the death rate of the species exceeds its birth rate for a prolonged duration, that species is called endangered and eventually it may become extinct. Such are Adhatoda vasica, Ageratum conysoides, Agave americana, Aloe vera, Ammania baccifera, Alternanthera sessilis, Asparagus adscendens, Cactus, Centella asiatica, Costus speciosus, Chlorophytum tuberosum, Gloriosa superba, Piper longum, Sinopodophyllum hexandrum, Rauwolfia serpentina, Saraca asoca, Strebles asper, Tribulus terrestris, Withania somnifera, Zamia pygmeae. Among these threatened plants 4 species were assessed as Critically Endangered (CR), 7 as Endangered (EW), 2 as Vulnerable (VU), 5 as Least Concern (LC) and 1 as Data deficient (DD) by the IUCN Red List in Uttar Pradesh and in the study area. The extinction and decline in plant diversity is caused by many factors, such as population growth, high rates of habitat modification and deforestation, climate change, pollution, the spread of invasive alien species and over-exploitation. Threatened species are being rehabilitated and restored to a protected area from their former habitats.