Sentence:  There are many disadvantages in using a <WSD>clavis</WSD> intended for another country, which necessarily includes plants that are absent from our islands while it omits some that are present and neglects the peculiarities of our island flora. 
Meaning of the word marked with <WSD> tags:  A key; an identification guide; a series of logically organized groups of discriminating information which aims to allow the user to correctly identify a taxon.