'Species' is required when you buy from an FSC/COC or CW/FM certificate or from a supplier with a Controlled Wood Risk Assessment who has sold you a product that contains wood from their risk assessment. Only scientific names are considered as valid input for the OCP.
The Wikipedia list is good reference for you to match common names of plants with scientific names. When it comes to entering species information, you will be able to select from a drop-down list:
To ensure that the scientific and common names of the species are correctly written, the organization should follow the available nomenclature of the Germplasm Resources Information Network (GRIN) Taxonomy Species Online Database (GRIN Taxonomy for Plants) .