Coniferophyta

Arboretum de Villardebelle
Includes photographs and information on conifers from around the world, gymnosperm taxonomy, and scientific articles.
http://www.pinetum.org/

Conifer Central
Resources, evaluation, books, nursery sources, description, and identification. Includes original keys to major coniferous genera.
http://members.tripod.com/~Hatch_L/concent.html

Conifers Images
Microscopic images of various parts and sections of conifers.
http://bryophytes.plant.siu.edu/diversityweb/conifers.html

Gymnosperm Database
Basic information (sometimes only a name) for all species and higher-ranked taxa of the gymnosperms, including conifers, cycads, and their allies. Includes many images.
http://www.conifers.org/

Gymnosperms
General introduction to the gymnosperms, the group of vascular plants whose seeds are not enclosed by a ripened ovary (fruit).
http://www.geocities.com/Heartland/Plains/6761/ecycads.htm

Native Conifers of North America
Key, descriptions of all genera and species, images, and range maps.
http://www.nearctica.com/trees/conifer/

Plant Diversity: The Conifers
Information and photographs of several gymnosperms that grow in the wet tropics of Australia.
http://www.wettropics.gov.au/pa/pa_conifers.html