Saxifragaviridiflora (Saxifragaceae), an unusual new species from Guangxi, China

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.

Seedless Vascular Plants Were the First Tall Plants on Earth