Number of plants on Earth

Here is the number of plants in the world :

AnimalTypePopulationSource yearSource
PhytoplanktonsPlant5 x 10^262017Weborus estimation
Other algaePlant3 x 10^172017Weborus estimation
PlantsPlant3 x 10^162017Weborus estimation
TreesPlant3 x 10^122015The Independant

Among plants, phytoplankton accounts for the largest share, with more than 99% of the total plant world. For every human, there are 400 trees and 40,000 plants.

There are more than 400,000 plant species (as opposed to 5,000 for mammals).

There is a total of 500 setpillion (million of quintillion) of plants on the planet.