(2) The number of poplars is: 150×30%=45 (plants),
The number of willows is 150×20%=30 (plants),
The number of buttonwood trees is:150×14% = 21(tree).
Other trees are: 150×20%=30 (trees).
Answer: (1) All kinds of trees planted in the school * * *150;
(2) The form is as follows: