The artificial system of classification is given by ___A___ and is based on ___B___.

	A	B
1.	Linnaeus	ultrastructure and anatomy
2.	George Bentham and Joseph Dalton Hooker	vegetative characters
3.	Linnaeus	androecium structure
4.	Engler and Prantl	evolutionary relationship

• A

  1

• B

  2

• C

  3

• D

  4