Floristic Composition and Biological Spectrum of The Bogdkhan Mountain, Mongolia

The Bogdkhan mountain of Mongolia is strictly protected and possesses a unique ecosystem, because its location in the transitional zone Siberian taiga Asian steppe. Floristic composition biological spectrum Mountain were studied during July 2019 to September 2020. A total 522 vascular plants recorded belonging 249 genera 63 families. Asteraceae was found be most dominant family (13.22%; 33 69 taxa) followed by Poaceae (8.43%; 21 44). classified life-form spectra all species from study area revealed predominance hemicryptophytes (63.03%) geophytes (11.30%), therophytes (10.34%), phanerophytes (9.58%), chamaephytes (5.36%), hydrophytes (0.38%). notable changes spectrum, which are 12 5.36%, 8 11.30% 10.34%. Variaty reasons might cause change life form, such as climate change, anthropogenic impacts, etc. Hemicryptophytes dominate flora due cold niche. floristic diversity this tends decline further videnced observed lesser divergence values therophytes. Bangladesh J. Plant Taxon. 29(2): 241-268, 2022 (December)