How Many Plant Species are There, Where are They, and at What Rate are They Going Extinct?

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The number of known plants species in the world and its annual increase (2016, methodology): “CHRISTENHUSZ & BYNG202 • Phytotaxa 261 (3) © 2016 Magnolia Press A higher estimate is by Pimm & Joppa (2015) which states that there are an estimated 450,000 species.”
Important Plant Areas: revised selection criteria for a global approach to plant conservation (2017, background): “Much of the world’s plant diversity is concentrated in these tropical regions—two thirds of all angiosperm species according to Pimm and Joppa (2015)—where existing protected area networks and national legislation frequently fail to protect key plant species and their habitats.”
Botanic garden solutions to the plant extinction crisis (2020, background): “…Earth, with an estimated 70,000 more yet to be formally described F I G U R E 3 Progress (as of March, 2020) on the Global Tree Assessment, an ambitious, garden-led initiative to evaluate by 2020 all ~60,000 of the world's tree species for their risk of extinction (Pimm & Joppa, 2015; Raven, 2020).”