Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleKnowing what we count: a comment on Guo.AuthorsPyšek, PetrAbstractA letter to the editor is presented in response to the article regarding the problems arising from different approaches to estimating the proportion of native or alien flora.SubjectsLETTERS to the editor; INTRODUCED species; BIOLOGICAL invasionsPublicationNeoBiota, 2011, Issue 10, p81ISSN1619-0033Publication typeLetterDOI10.3897/neobiota.10.1976