according to previous studies, the genus rheum in iran includes four species: r. turkestanicum janisch., r. persicum losinsk., r. ribes l. and r. khorasanicum baradaran & jafari. during the long-term study, based on field and many herbaria specimens, three new species including r. iranshahrii taheri & assadi sp. nov., r. kordestanicum taheri & assadi sp. nov. and r. austro-iranicum taheri & ass...
