https://www.rhs.org.uk/plants/301327/erophila-verna-subsp-praecox/details
Find help & information on Erophila verna subsp. praecox from the RHS
erophila vernasubsppraecoxrhs
https://www.rhs.org.uk/plants/132694/stachyurus-praecox-devon-purple/details
Find help & information on Stachyurus praecox 'Devon Purple' early stachyurus 'Devon Purple' from the RHS
stachyurus praecoxdevonpurpleearlyrhs
https://www.rhs.org.uk/plants/229798/agapanthus-praecox-subsp-orientalis-indigo/details
Find help & information on Agapanthus praecox subsp. orientalis 'Indigo' from the RHS
agapanthus praecoxsubsporientalisindigorhs
https://www.rhs.org.uk/plants/232029/astilbe-simplicifolia-praecox-rubra/details
Find help & information on Astilbe simplicifolia 'Praecox Rubra' from the RHS
astilbe simplicifoliapraecoxrubrarhs
https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?id=177018
THE NCBI Taxonomy database allows browsing of the taxonomy tree, which contains a classification of organisms.
caladenia praecoxtaxonomybrowser