As of 2010, there were approximately 400,000 types of flowering plant species in the world, known that is.
Perennial /pəˈrɛnɪəl/ ~ Lasting or existing for a long or apparently infinite time; enduring or continually recurring. (Of a plant) Living for several years.
Botany is the scientific study of plants; how plants function, what they look like, how they are related to each other, where they grow, how people make use of plants, and how plants evolved.
According to many reports there are roughly 400,000 different species of flowers found on the planet.