Abstract

• Grass belong to family Poaceae (Gramineae) and the one of the largest family in monocotyledon gramineous flowering plants. Grass taxonomy is very differ and difficulty from other flowering plants. Altogether 15 species, 13 genera, 8 tribes, 4 subfamilies in family Poaceae were collected from Loiem district of Southern Shan State of Myanmar, flowering time from 2018 to 2019.The habitat, underground portions, vegetative and reproductive parts of collected species were presented with photograph records. The whole plant portions are classified, identified, verified and evolutionary status by principles author citations of vegetative and reproductive characters. This paper highlights the modified differences characteristics and evolutionary trends of wild mountain grasses in Loilem district of Southern Shan State.