The WAP complex is the largest continuous region of protected areas in West Africa. It is located in the border region of Burkina Faso, Benin and Niger. There has been a lot of research going on in the area in the past decades, but also ecotourism activities, so there may be a lot of observations around.

We recently started a series of guides, that may be useful for determination:

Ferns - http://www.inaturalist.org/guides/3961
Monocots - http://www.inaturalist.org/guides/3918
Legumes - http://www.inaturalist.org/guides/3962
Other dicots - http://www.inaturalist.org/guides/3963

Amphibians - http://www.inaturalist.org/guides/4215
Reptiles - https://www.inaturalist.org/guides/4951
Birds - http://www.inaturalist.org/guides/4289
Mammals - http://www.inaturalist.org/guides/4290

Other online material useful for plant determination is
African Plants - a photo guide: http://www.africanplants.senckenberg.de
the FWTA eBook: http://www.kew.org/discover/news/flora-west-tropical-africa-ebook1