Ducksters
Ducksters: Biology for Kids: Non Flowering Plants
On this site, learn about the biology of non-flowering plants including gymnosperms, conifers, cones, seed, spores, ferns, and mosses.
Ohio State University
Ohio State University: Development From Seed to Plant
A thorough discussion of the environmental cues that can trigger germination and of the changes in structure that result. Charts, graphs, and links are also provided.
Other
Kitchen Culture Kits, Inc.: Plant Tissue Culture
An excellent site for learning about plant tissue culture. Great visuals and easy to understand instructions. Lots of links to other good sources.
BiologyWise
Biology Wise: Life Cycle of Angiosperms
Describes the characteristics of angiosperms, or flowering plants, the parts of the flower involved in reproduction, pollination, fertilization, and the production of fruit and seeds.
Virginia Tech
Virginia Tech: Flower and Tree Reproduction
This is the reproduction chapter from an online text, courtesy of the Forest Biology Department of Virginia Tech. Learn about trees, their flowers, and other details of their reproductive cycle.
Other
Zephyrus: Flower Reproduction
A good graphic overview of flowering plant reproduction and the specific parts of the plant responsible for that.
Colorado State University
Gardening & Horticulture in Denver: Gardening With Children
The section on plant projects for kids has lots of hands-on ideas for studying plant biology. Activities are included for stages from seed germination to growth. Geared more to the younger student.
Ohio State University
Ohio State Univ.: Gymnosperms (Conifers & Relatives)
A review of conifer biology. Illustrations are great and help clarify the text, which can get a bit advanced for a general audience. A great resource for exam review.
Science Education Resource Center at Carleton College
Serc: Tree Leaf Identification and Leaf Display Activity
In this Biology field activity, students collect tree leaves and seeds to make an identified collection after drying in a plant press, a phone book, or in magazines.