When most Australians say
tea-trees they are referring to Melaleucas or Agonis spp, not Leptospermums
I'm afraid, just a misnomer.....you are correct in that a tea-tree IS a
Leptospermum.
Er Margie, this Aussie (whose knowledge of
natives is profoundly limited) but grew up in Sout Aust and now lives in
New South Wales has only ever know Leptospermums and tea-trees to be synonyms,
the NSW synonym for agonis flexuosa is "willow myrtle" to the best of my
knowledge and typically melaleuca's are known as "paperbarks" - maybe the
Nullabor is the 'great divide' as opposed to the Great Dividing
Range!!
Jane