Reasons for vairation within species
genotype, environment, natural selection
Heterophylly
Different types of leaves on the same plant
l1/l2 mutation
sometimes a mutation occurs in plant leaf layers
Chimera
mutation has occured in only part of the shoot/plant
Light
plant grown in different light conditions will have different outcomes
Edaphic factors
soil conditions that can influences fertillity
suckers
grow from root system
watersprouts
grow from trunk above ground
heterosis
the hybrid is stronger and bigger than either parent