Links for Cirsium spp., thistle
Databases
Search for Cirsium spp. in the Global Biodiversity Information Facility (GBIF).
Search for Cirsium spp. in the Encyclopedia of Life (EOL).
Search for known associations between Cirsium spp. and plants in the Plant-SyNZ database.
Search for Cirsium spp. in the Species 2000 & ITIS Catalogue of Life.
Taxonomy
Check the taxonomy of Cirsium spp. in the Universal Biological Indexer and Organizer (uBio).
Scientific literature
Search the internet for scholarly articles about Cirsium spp. using Google Scholar.
Images
Search for images of Cirsium spp. on the internet using Google Images.
