Count the species in each genus

Twelve scientific names of plants are listed. You will take the genus of each, count the species in each genus, and find the biggest genus. Then the program draws a bar for each genus.

The idea. The genus is the first word of a scientific name. Names that share it are close relatives.

Your tasks.

1. Set genera to the genus of each name, in the order of the list.
2. Set counts to a dictionary of each genus and its number of species.
3. Set biggest to the genus with the most species.