Below is a selection of links for your interest and reference relating to botanical nomenclature and plant taxonomy and aimed at all levels.
Royal Horticultural Society (RHS)
A free and user friendly plant finder with a comprehensive database. Usually a first choice with amateurs and professionals.
International Plant Names Index (IPNI)
The IPNI provides a searchable index of plant names in accordance with the International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) 2018. Includes links to the BHL & RBG Kew.
Botanic Gardens Conservation International (BGCI)
The BGCI represents Botanic Gardens throughout the world and provides a comprehensive name search including conservation status filters. This site provides a facinating insight of the plant sciences with links to Botanic Gardens throughout the world.
Plant Heritage
Plant Heritage is a vital charity dedicated to the support of our national plant collections and conservation of threatened plant species in the UK. An exceptional resource for practical and scientific information.
Trees and Shrubs Online
A project by the International Dendrology Society’s to create a modern, web-based encyclopaedia of woody plants hardy in the temperate parts of the world. Based on data formed from Bean’s Trees and Shrubs Hardy in the British Isles and of New Trees.