Regular Websites
PlantzAfrica is a botanical information website that provides details about the various plants that can be found in Africa. You can find an alphabetical list of plants found on the continent and look up information on African trees. The website has a section on gardening African plants. - PlantzAfrica
http://www.plantzafrica.com/
University and Jepson Herbaria
The University and Jepson Herbaria is an academic website that provides information about pressed plants and other plant specimens. Based at the Unviersity of California at Berkeley, the collection has over two million plant specimens. You can also access plant databases from this website. - University and Jepson Herbaria
http://ucjeps.berkeley.edu/