Ramanath Parimi
2

Very interesting question.


According to https://www.currentresults.com/Environment-Facts/Plants-Animals/estimate-of-worlds-total-number-of-species.php ,  there are seven million species of plants and animals (the original could be higher) currently live on earth. Out of which, roughly 0.39 million species are there in plants category.


Further classifying,


  1. Flowering plants - 0.35 M
  2. Conifers  - 1,050
  3. Ferns and horsetails - 15K
  4. Mosses - over 22k