Which of these correctly indicates that a portion of the quote ha0s been omitted?
“the violets—have broken the rocks.” – tennessee williams
“the violets/have broken the rocks.” – tennessee williams
“the (violets) have broken the rocks.” – tennessee williams
“the violets…have broken the rocks.” – tennessee williams

The long dash is used in pairs or singularly at the end of a sentence to add information that may be about the same subject but not relevant to the topic at hand.

e.g: my mother likes roses and tulips -- she displays flowers in her room.

the forward slash is most commonly used as a shorthand for 'or'.

e.g: my mother buys roses/tulips to display in her room.

ellipses (...) indicate unlisted examples, a pause or the passing of time.

e.g: my mother displays the flowers in her room: roses, tulips, violets, sunflowers, lilies...

e.g: "my... mother displays flowers in her room," she said hesitantly.

e.g: "... my mother displays flowers in her room," she told me after a few minutes of silence.

brackets around a word used in a quote indicate that the word has been omitted.

It would be tan believes that nonstandard english can be an important part of family culture.