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17A common and genus name of the plant with the variety bonariensis which rivals the buddleia in its ability to attract butterflies (7) *E*B*N*
19a Botanical name for the fruit of trees or shrubs including, apple,Hawthorn,,loqual,medlar, pear and quince (4) *O*E
28d = unit of weight for diamonds (which I thought was carat) *O*N*
25A = THE DEN OF AN ANIMAL KNOWN COLLECTIVELY AS A ROMP,BEVY,FAmily or when in water a raft (4)*O*E
53 English epidemiologit wo helped determine the link between smoking and lung cancer (4) D*L*