Why is morning glory called morning glory?

So why did people give it such a name? It turns out that its name has a story. A long time ago, there was a place whose name could not be described. No one knew when, but suddenly there appeared a mountain that looked like a cow lying down, so people called this mountain "Funiu Mountain". At the foot of this mountain, there is a small village with not many people. One of the families had a set of twin sisters. Because the villagers were poor and had no money to buy cows to plow the fields, they could only make some crude tools to plow the fields.

As for the twin sisters, they reclaimed the wasteland in front and behind the mountain and planted crops with their own hands. They lived a decent life. The two sisters were kind-hearted and willing to help those who were poorer than them. One day, two sisters were digging the ground, and suddenly they couldn't dig anymore. It turned out that there was something very hard there, and the two sisters couldn't dig it open no matter what, so they sat aside to rest. Suddenly, the hard thing popped open, and the sister saw a shiny object. They took it out and looked at it carefully, and it turned out to be a silver trumpet.

The two were wondering, when suddenly an old man came over and said to them with a smile, "This mountain was sent down by the Jade Emperor to suppress a hundred demons. These demons transformed into human forms because of their cultivation, but they did evil in the human world without any care, so the Jade Emperor accepted them and suppressed them here. It has been nine hundred years today. Tomorrow they will turn golden and will no longer harm the human world. This trumpet is the key to this mountain. Tonight you will hear a sound coming from the mountain, and then a golden light will emerge. That is the eye of the mountain. Just insert this thing in, but you still have to remember the formula... Then the eye of the mountain will become bigger, and you can go in and hold a golden bull out, so that you will never have to worry about food and drink for the rest of your life. This key only appears once every nine hundred years, and it will be useless at dawn. Don't be locked in there, otherwise you will definitely die. Also, don't blow this trumpet, otherwise all the hundred bulls will rush out."

The two knew that it was a god, and they went home happily, planning how to take the golden bulls away. The elder sister wanted to take out all 100 and distribute them to the poor villagers, while the younger sister wanted to blow the trumpet to bring the golden bulls to life and distribute them to the villagers. In the end, the younger sister's idea was approved.

As expected, the eye of the mountain became bigger at night, but it was only big enough for one person to go in. The elder sister went in, and the younger sister followed later. When the trumpet was blown, the golden bull came to life. But when the last one rushed out, the sun slowly rose and the eye of the mountain became smaller. The two sisters pushed the bull's butt but could not move it.

The villagers worked together to pull the last cow, but the cow kicked out of pain, leaving the two sisters trapped in the mountain. The trumpet at the eye of the mountain turned into a flower, so the flower was named this in memory of the two sisters.