How many species of seed plants are there

By Robert W. Scotland, A. Wortley. 2003

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Ectomycorrhizal lifestyle in fungi: global diversity, distribution, and evolution of phylogenetic lineages (2010, background): “220,000– 420,000 estimated plant species (ca. 2%; Scotland and Wortley 2003; Brundrett 2009) and the 1,500,000 fungal species (0.”
Future habitat loss and the conservation of plant biodiversity (2010, background): “…countries overlap with the network of Biodiversity Hotspots and they contain a total of 206,905 endemic plant species which represent 64.1% of the global flora based on the mean of the estimated lower (223,300; Scotland and Wortley, 2003) and upper limits (422,000; Govaerts, 2001; Bramwell, 2002).”
Global State of Biodiversity and Loss (2003, result): “Govaerts R. 2001.”
Innovative approaches to the preservation of forest trees (2014, unknown): “With an estimated 223,000–353,000 species of higher plants (Scotland and Wortley, 2003; Chapman, 2009) and the physiological screening of all species unlikely in the short-to medium-term, it is important to develop predictive biological models that help indicate risks associated with handling seeds…”
Fish biodiversity and conservation in South America. (2016, background): “2016, 89, 12–47 taxa such as birds and flowering plants (Scotland & Wortley, 2003; Wortley & Scotland, 2004).”