A checklist is provided of the gymnosperms and angiosperms of the Southeast Asian country of Myanmar. This list, containing 273 families, 2,371 genera, and over 11,800 species, is updated from four previous editions dating back to 1912. The list was compiled from earlier lists, an inventory of specimens from select herbaria, advice from taxonomic specialists, and records from Index Kewensis and regional floras of neighboring countries. The entry for each species includes the Latin binomial, author, plant habit, distribution, and common Myanmar and English names. Political and vegetation maps, color plates of some common species and vegetation types, and indices to family, species and common names are provided.