Didactic: adjective - with the character or manner of a teacher, intended to instruct, with instruction as its ulterior purpose.
Noun - didactic author or treatise; the art of teaching.
We all come across and know about didactic literature, even if we don’t necessarily know the term for it. With its academic tone, intended to educate, it carries connotations of heavy-handedness.
‘The novel was so obviously didactic that most readers were immediately put off reading it.’
‘Are you actually trying to bore them, George, or is your didactic prose somehow supposed to attract people to your words? You might have more success if you concentrated less on teaching your readers and more on telling the story.’
Nothing suitable on Zemanta, so here's a picture of an Iris I took in the back garden a week or so ago.