Plantae (land plants)

[= Embryophyta]

Anthocerotophyta (hornworts)
Bryophyta (mosses)
Marchantiophyta (liverworts)
Tracheophyta (vascular plants) In older classifications there was the group Pteridophyta (ferns and fern allies; i.e. all spore-bearing tracheophytes) which included Equisetophyta, Filicophyta, Psilotophyta and Lycopodiophyta.
	Lycopodiophyta (club mosses)
	Euphyllophyta
		Monilophyta (ferns, including horsetails)
		Lignophyta (woody plants)
			# "Progymnosperms" This is a loose term used to refer to fossil lignophytes that are not seed plants. The most well-known member of this group is the genus Archaeopteris, which was a genus of large trees with conifer-like wood, fern-like leaves and was spore-bearing.
			Spermatophyta (seed plants)
				# "Pteridosperms" (seed ferns) Known only from fossils, these plants looked like ferns but had seeds. The name is put in quotes because this group is probably paraphyletic because within it the gymnosperms and angiosperms are likely to have evolved.
				Gymnospermae (gymnosperms)
				Angiospermae ( or Magnoliophyta) (flowering plants)

W3Tropicos. The Missouri Botanical Garden's nomenclatural database covering vascular plants and bryophytes. You can use this, for instance, for finding out the taxonomic history of a name and the synonyms associated with it or you can use it for generating species lists for particular genera or genus lists for particular families. It will also list for particular species details of specimens in the Missouri Botanical Gardens herbarium.
The Gymnosperm Database. Excellent site with in depth information on taxa in this group.
National Botanical Institute. Supplies information on the activities of this South Africa's premier botanical organisation.
Plantzafrica.com. Web site on indigenous plants of South Africa hosted by National Botanical Insitute. Contains useful information on the vegetation regions of South Africa and detailed information on selected plant species.
Sabonet - Southern African Botanical Diversity Network. The web site for this project which spans all the countries of southern Africa. A good place to visit to find out about the work being undertaken in compiling lists of rare and threatened plants in southern Africa, although no actual lists or databases are supplied.

Graham, L.E., Cook, M.E. & Busse, J.S. 2000. The origin of plants: body plan changes contributing to a major evolutionary radiation. Proceedings of the National Academy of Sciences 97: 4535-4540. See online version