In the fifth and last contribution to the flora of Khorassan 143 angiosperm plant taxa from 180 genera in 28 families are recorded for the first time. 21 of these taxa are endemic to Iran. The specimens cited in thispaper are deposited in several herbaria, i.e, BASU, FAR, FUMH, IRAN, K, MO, SUTH, TARI, TUH, W. This contribution is a continuation of the recently published papers on this province (GHAHREMANINEJAD & al.2005,JOHARCHI&al.2007,GHAHREMANINEJAD&al.2010,JOHARCHI&al.2011). In the five papers(including the present) 586 species are reported for the first time from this province. Furthemore, as in the recently published part IV (JOHARCHI & al.2011), specimens from Khorassan representing new taxa or new records for Iran published in other papers are listed here to give a complete overview. This series of five papers serves as supplement to Flora Iranica treatments (RECHINGER 1963-1999, 2001-2011) for the Khorassan province flora.

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