| Name | Description |
| Botanical Society of Britain & Ireland | A scientific society for the study of flora, plant distribution and taxonomy relating to Great Britain, Ireland, the Channel Islands and the Isle of Man. |
| The British Lichen Society | The BLS aims to promote and advance the teaching and study of lichens and encourage and actively support the conservation of lichens and their habitats. |
| British Bryological Society | The British Bryological Society exists to promote the study of mosses and liverworts. |
| Fossil Plants | A fascinating web site about a garden run by Robbie Blackhall-Miles in North Wales that specialises in growing plants that have a fossil record of at least 60 million years. |
| The Linnean Society of London | The world’s premier society for the study and dissemination of taxonomy and natural history. |
| Royal Horticultural Society | The UK’s leading gardening charity. |
| Systematics Association | The Systematics Association is committed to furthering all aspects of systematic biology. |
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