fasciation
noun
fas·ci·a·tion ˌfa-shē-ˈā-shən 
ˌfa-sē-
: a malformation of plant stems commonly manifested as enlargement and flattening as if several stems were fused
Example Sentences
Recent Examples on the Web This is a plant often distorted by fasciation, stalks flattening and growing broader than normal, or leaf shapes being distorted. 
Margaret Lauterbach, idahostatesman, 31 May 2017 Fasciation may be caused by mutation, virus, bacterial infection by bacterium known as Rhodococcus fascians, or injury to the meristem or growing part of the plant by insect, animal or human. Margaret Lauterbach, idahostatesman, 31 May 2017 Plants especially susceptible to fasciation include ferns, willow trees, delphiniums, foxgloves, forsythia, euphorbias, lilies, primulas and verbascums such as the mullein. Margaret Lauterbach, idahostatesman, 31 May 2017
Margaret Lauterbach, idahostatesman, 31 May 2017 Fasciation may be caused by mutation, virus, bacterial infection by bacterium known as Rhodococcus fascians, or injury to the meristem or growing part of the plant by insect, animal or human. Margaret Lauterbach, idahostatesman, 31 May 2017 Plants especially susceptible to fasciation include ferns, willow trees, delphiniums, foxgloves, forsythia, euphorbias, lilies, primulas and verbascums such as the mullein. Margaret Lauterbach, idahostatesman, 31 May 2017 Word History
First Known Use
1677, in the meaning defined above