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.
Biology Pages
Kimball's Biology Pages: Plants
RCN offers information about plants, including the evolution and classification of different groups.
Biology 4 kids
Biology4 Kids: Ferns and Horsetails First Plants With Pipes
Brief informational text highlighting the first vascular plants on earth, the ferns and horsetails.
CK-12 Foundation
Ck 12: Life Science: Vascular Seedless Plants
[Free Registration/Login may be required to access all resource tools.] Vascular seedless plants have vascular tissue but do not have seeds. Most of the large vascular seedless plants from ancient times are now extinct, but their smaller...
BiologyWise
Biology Wise: Seedless Vascular Plants and Their Characteristics
Explains what vascular plants are and the characteristics of seedless vascular plants. Gives detailed descriptions of whisk ferns, club mosses, horsetails, and ferns.
CK-12 Foundation
Ck 12: Life Science: 7.6 Vascular Plants
Learn the structure and function of vascular plants.