Ohio State University
General Plant Biology: Seedless Vascular Plants
Use this very concise summary except to become familiar with these examples of less complex plants. Some of the terminology is at a more advanced level.
Ohio State University
Ohio State University: Anthophyta, Evolution & Diversity
An online summary of the evolution of flowering plants at an advanced level. The text is supported by good illustrations and is followed by a quiz. This is a good review for exams.
Other
Ohio State University: Cryptogamia (Seedless Plants)
Psilophyta, lycophyta, sphenophyta, are the three divisions of plants depicted in this focused site. Examples of each division is provided along with pictures.