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Attempt to clarify content

The limits of the genus are currently very unclear, as is the number of species; both vary widely from source to source. This makes it difficult to write about clearly. I have restructured the article to conform more closely to Wikipedia:WikiProject Plants/Template and make it a bit easier to follow. A Description section is still needed. Peter coxhead ( talk) 17:30, 19 March 2013 (UTC) reply