摘要：Plants show an incredible diversity of forms,dimensions,archi-tectures,structures,and reproductive ***,they can be geometrically described as composed of simple building units called phytomers,which are produced by the shoot apical meri-stem(SAM).A phytomer is made up of a node bearing a leaf and an axillary meristem,and of an internode connecting the node to the following *** of phytomers creates the plant body,similarly to a LEGO construction made of simple *** of the phytomeric unit creates *** leaf can change in size and shape;the axillary meristem can be dormant or active,determinate or indeterminate;the internode can elongate considerably,or be compressed to the extent it might look invisible.