250,000 to 400,000 Species
||Gruber CW et al., Distribution and evolution of circular miniproteins in flowering plants. Plant Cell. 2008 Sep20(9):2471-83. p.2478 table 4, note beneath tablePubMed ID18827180
||Thorne, R.F. (2002). How many species of seed plants are there? Taxon 51: 511-522. AND Govaerts, R. (2003). How many species of seed plants are there? A response. Taxon 52: 583-584. AND Scotland, R.W., and Wortley, A.H. (2003). How many species of seed plants are there? Taxon 52: 101-104.
||Total number of flowering plant species is estimated to be 250,000 to 400,000 (primary sources).