International Carnivorous Plant Society
The ICPS is made up of gardeners, conservationists, scientists and educators all interested in sharing knowledge and news of carnivorous plants. They welcome hobbyists just getting started all the way through to professional scientists to join the society. Take a look around the website and you'll find historic documents about carnivorous plants, growing guides, free educational resources and more!
https://www.carnivorousplants.org/
You can also find the list of registered cultivars there;
https://cpnames.carnivorousplants.org/Cultivars.php
The Carnivorous Plant Society
The Carnivorous Plant Society was formed in London in 1978 to promote the study and conservation of carnivorous plants. It became a registered charity in 1981.
The Society brings together anyone interested in these amazing plants – from novice growers to the world’s leading experts – to protect the species and habitats that are most at risk; inspire and teach the public; and to encourage cultivation. This work is made possible through the support of the Society’s fantastic members.
The Society is based in the UK but welcomes members from around the world.
John Jearrard Guide
This website has been a helpful resource for me when researching particular clones of Sarracenia. The de-confusifier helps when reconciling clones with multiple clone numbers from different growers.
http://www.johnjearrard.co.uk/plants/sarracenia/genus.html
http://www.johnjearrard.co.uk/plants/sarracenia/deconfusifier.html
Carnivorous Plants UK Facebook Group
Carnivorous Plants UK is a family friendly group and community. This Facebook group was set up for people to discuss carnivorous plants in general, swap ideas, information, seeds, grow lists etc. You can also post pictures and ask questions for other members to answer.
https://www.facebook.com/groups/10667458939
Carnivorous Plant Photo Finder
This is a great resource if you are looking for photos of any particular species, hybrid or cultivated variety of carnivorous plant.
The National Collections
Mike King holds the national collection of Sarracenia and Dionaea at his home in Telford, Shropshire. Keep an eye out for Mike's open days when you can see one of the best collections of carnivorous plants anywhere.
https://www.carnivorousplants.uk.com/
The Carnivorous Plant FAQ
Here you may learn about the ecology, cultivation, conservation, and taxonomy of carnivorous plants. Unless indicated, Barry Rice is the author of all text in the FAQ.
https://www.sarracenia.com/faq.html
CPUK Forum
A carnivorous plant form by The Carnivorous Plant Society. A great place to ask questions, discuss ideas and buy or sell plants.
https://www.cpukforum.com/forum/index.php
Wikipedia
You all know what Wikipedia is! I find the following pages give a real base-line of knowledge of carnivorous plants. A good starting point for any research (with references at the bottom of each page).
https://en.wikipedia.org/wiki/Carnivorous_plant